92 Answered Questions for the topic Normal Distribution

Normal Distribution Algebra 2 Probability

08/14/17

what is the probability that a randomly selected 3-year-old is between 32.8 in. and 36.4 inches in height?
The heights of 3-year-olds at a preschool averaged 35.2 inches, with a standard deviation of 1.2 inches. Assuminga normal distribution: a. 81.5%       b.13.5%        c.47.5%         d.68%
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Normal Distribution

07/31/17

The average test score of the class was an 80 and the standard deviation was 2. About 99% of the class would score between what 2 values?
I have to find two values.
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Normal Distribution Probability & Statistics

05/23/17

If a normal distribution has a mean of 65 and Standard deviation of 8. What score bounds the 19.8% below the mean?
I know how to solve the normal distribution in terms ofBelowBetween Two numbersAnd above the numberBut i don't know how to solve this with this kind of question.
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Normal Distribution

05/19/17

question is about normal distribution
The actual amount of instant coffee that a filling machine puts in to “4”ounce jars may be looked upon as a random variable having a normal distribution with σ = 0.04 ounce. If only 2% of the jars... more
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Normal Distribution

11/29/16

in a normal distribution with standard deviation of 5.0, the probability than an observation x selected at random is greater than 20 is 0.96(p(X>20)=0.96)
I DO NOT KNOW HOW TO SLOVE IT
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Normal Distribution

11/16/16

normal distribution
The scores of a test given to students are normally distributed with a mean of 21.80 % of the students have scores less than 23.7. (a) Find the standard deviation of the scores.
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Normal Distribution

11/02/16

the mean of a normally distributed set of data is 56, and the standard deviation is 5. in which interval do approximately 95.4% of all cases lie?
the answers are either 46-56, 51-61, 46-66, 56-71  
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Normal Distribution Math Help Alegbra 2 Z Score

05/20/16

Scores on a certain IQ test are approximately normally distributed with a mean of 110 and a standard deviation of 25. In what range do the middle 95% of all sco
PLEASE HELP!!!!
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Normal Distribution

04/18/16

Can someone check this
Which description of normal distributions is correct (select all that apply)? a. Normal distributions have a mean of zero and standard deviation of one. b. Normal distributions can differ in... more
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Normal Distribution

04/18/16

Help with a question
Consider a normal distribution with a mean of 12 and variance of 4. Approximately 82% of the area lies between which values? a. 6 and 13 b. 10 and 16 c. 9 and 15 d. 10 and 18 e. Not enough... more
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Normal Distribution Statistics

04/04/16

Statistics: Normal Distribution
The inside diameter of a manufactured cylinder is believed to follow a normal distribution centered at 5 inches with a standard deviation of .03 inches. The diameter of the cylinder must be within... more
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Normal Distribution Probability Statistics Question

04/03/16

NOrmal distribution question: Stastics - 2
Suppose a study finds that the wing lengths of houseflies are normally distributed with a mean of 4.55mm and a standard deviation of about 0.392mm. What is the probability that a randomly selected... more
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Normal Distribution

02/17/16

Mean x¯= 120,standard deviation is 25, find the area or percentage; solve for Z-value and find the area in table then Select: Add or subtract from 50%?
Mean x¯= 120, standard deviation is 25, find the area or percentage; solve for Z-value and find the area in table then Select:  Add or subtract from 50%? a. above 130 b. below 130 c.  above... more
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Normal Distribution

02/17/16

Mean x¯= 120, standard deviation is 25, find the area or percentage of
Mean x¯= 120, standard deviation is 25, find the area or percentage of:   1. 100 to 140 (note: there are two areas to be added) 2. 80 - 110 (two areas to be subtracted)
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Normal Distribution

02/16/16

Determine how many branches have a sales of:
The average net sales / year of the products in 60 branches (N) of Ray. Cañero co. inc. is 85M (mean), With a standard deviation of 15M. 60 to 85M? 70 to 105M? 90 to 110M? Above 110M? Below 60M?
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Normal Distribution

02/16/16

Mean x¯= 120, standard deviation is 25, find the area or percentage of:
Mean x¯= 120, standard deviation is 25, find the area or percentage of: 1. X = 100-120 2. 100 to 140 (note: there are two areas) 3. 80 - 110 (two areas to be subtracted)
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Normal Distribution

02/05/16

Normal Distribution
An automobile manufacturer introduces a new model that averages 27 miles per gallon in the city. A person who plans to purchase one of these new cars wrote the manufacturer for the details of the... more
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Normal Distribution

02/05/16

Normal Distribution
Heights of adult women in the United States are normally distributed with a population mean of μ = 63.5 inches and a population standard deviation of σ = 2.5. A medical researcher is planning to... more
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01/26/16

Probability Distribution of two normally distributed independent random variables.
If X~N(10,3) and Y~N(15,8), and if X and Y are independent, what is the probability distribution of1. X +Y2. X-Y3. 3X4. 4X + 5YIf X and Y are positively correlated with a correlation coefficient of... more
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Normal Distribution Statistics Statistics Question

11/23/15

A new drug will not be considered for acceptance by Health Canada unless it causes serious side effects in less than 0.01percent of the population
A new drug will not be considered for acceptance by Health Canada unless it causes serious side effects in less than 0.01percent of the population. In a trial with 80,000 people, 9 suffered serious... more
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11/20/15

the margin of error would be what?
The length of time what a space rocket component functions is approximately normally distributed. A sample of 20 of these components showed a mean of 900hours with a standard deviation of 87 hours.... more
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Normal Distribution Statistics

11/19/15

The heights of American women ages 18 to 24 are normally distributed with a mean of 65 inches and a
standard deviation of 2.5 inches. In order to serve in the U.S. Army, women must be between 58 inches and 80 inches tall. What percentage of women are ineligible to serve based on their... more
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Normal Distribution Standard Deviation Normal Curve

11/04/15

in 1995, SAT math scores werenormally distributed with mean 500 and standard deviation 100 points.
What percent of students scored greater than 410?
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Normal Distribution Standard Deviation

11/04/15

The results of an IQ test have a mean of 100, and scores are normally disributed with a standard deviation of 15 points.
 What is the IQ score of the person at the 79th percentile?        I got 81 but I don't know if I'm doing it right
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10/18/15

Beginner statistics question? Please help!! What formula should I use? How should I solve this?
Florida Hurricanes: The following distribution for X = annual number of hurricanes in the state of Florida was reported in an article entitled “What Seasonal Hurricane Forecasts Mean to Florida”.... more
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