60 Answered Questions for the topic Normal Distribution

Inverse normal distribution

The SAT test is a test taken by any students to enter college. THe mean of the math section is 500 with a standard deviation of 100. The scores are normally distributed. What score is the cutoff... more

09/08/19

Normal Distribution and Z scores

The SAT Mathematics are know to follow an approximate normal distribution with a mean of 500 and a standard devation of 100. The ACT Mathematics are known to follow an approximate normal... more

06/15/19

Normal Distribution Question

Assume that x has a normal distribution with the specified mean and standard deviation. Find the indicated probability. (Round your answer to four decimal places.)μ = 4; σ = 2P(3 ≤ x ≤ 7)

06/07/19

How do I find the probability that X is greater than 16.1

assume that X has a normal distribution, and find the indicated probabilityThe mean is 15.2And standard deviation is 0.9Find the probability that X is greater than 16.1

05/17/19

The life of a Radio Shack record player is normally distributed with a mean of 3.2 years and a standard deviation of 0.8 years. Radio Shack guarantees its record players for 2 years.

(a) Find the probability that a record player will last less than 2 years?(a) Find the probability that a record player will last more than 4 years?

05/16/19

normal distribution

Battery manufacturers compete on the basis of the amount of time their products last cameras and toys. A manufacturer of alkaline has observed that its batteries last for an average of 26 hours... more

04/25/19

Normal Distribution

Assume that human body temperatures are normally distributed with a mean of 98.23°F and a standard deviation of 0.62°F.a. A hospital uses 100.6°F as the lowest temperature considered to be a... more

08/07/18

mean: 21.1 and the standard deviation 5.0. Are any of these values unusual? Why or why not?

The ACT is an exam used by colleges and universities to evaluate undergraduate applicants. The test scores are normally distributed. In a recent year, the mean test score was 21.1 and the standard... more

07/17/18

Binomial as Normal

Chelsea play 38 league games in a season. Their probability of losing each game is 0.25. If they lose fewer than 8 games, they will win the league. What is the probability they win the... more

04/02/18

There is a 88.4% chance that my value of x is 30 or greater. If I assume my data is normally distributed..

There is a 88.4% chance that my value of x is 30 or greater. If I assume my data is normally distributed, can I determine the likelihood that my value of x is 26, 27, 28, 29, 31, 32, 33, 34... more

03/15/18

The mean Algebra 2 test score is 81.5, with a standard deviation of 5.1. Assuming a normally distributed curve..

What percent of students scored between 81.5 and 91.7?   Please explain.

02/18/18

read the description . I need work and an explanation

Tom and Jan are planning on applying to attend KSU. Tom takes the ACT while Jan decides to take the SAT. The mean score on the ACT is a 17 with a standard deviation of 5, and the SAT mean score is... more

11/19/17

Z= -0.12 Z=0

11/19/17

Z= -1.48 Z=0

11/19/17

Z= -2.00 and Z=0

11/19/17

Find the area under the standard normal probability distribution between the following pairs of​ z-scores.

Z= -1.00 and Z=0

10/16/17

normal distribution

Assume that adults have IQ scores that are normally distributed with a mean of 105and a standard deviation equals 20. Find the probability that a randomly selected adult has an IQ less than 141.

08/24/17

Is it possible to do one way ANOVA between groups of data with different scales

I have 7 groups of data and the size of every group is 46. I want to do the parametric analysis of ANOVA between these groups. When every group of data has been checked for normality, the results... more

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%

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.

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.

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

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

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.

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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