843 Answered Questions for the topic Statistics Question

10/29/17

#### Find the margin of error for the given confidence level and values of x and n. x=111,n=194, confidence level 99%

I have no clue on how to solve. Please help

10/22/17

#### How to find a percentage with a normal distribution

The length of time it takes to find a parking space at 9 A.M. follows a normal distribution with a mean of 5 minutes and a standard deviation of 2 minutes. Eighty percent of the time, it takes more...
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10/15/17

#### QUESTION IS IN THE DESCRIPTION (ENTER ANSWER AS WHOLE NUMBER)

Assume you have a room of 10 Facebook users and the average number of friends is 130. If one person in this room adds 50 new Facebook friends (none of whom are in the room), then what would be the...
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10/15/17

#### The annual returns on one type of investment bond has a mean of 10.73% and a standard deviation of 6.12%.

The annual returns on one type of investment bond has a mean of 10.73% and a standard deviation of 6.12%. If the distribution is unimodal and symmetric with no outliers, what can we say about the...
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10/15/17

#### It's statistics and probability related question.

a) A survey of park showed an average expenditure of Rs. 10.30. If for 20 girls the average expenditure was Rs.9.70 and Rs. 11.1 for the boys. Find the number of boys.b) A computer calculated a...
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10/13/17

#### the average gpa is 4.0 with standard deviation of .2. What percent of admitted students had a gpa lower than 3.5

the average gpa is 4.0 with standard deviation of .2. What percent of admitted students had a gpa lower than 3.5

10/11/17

#### Statistics question, please help asap?

The time to complete a standardized exam is approximately normal distributed with a mean of 100 minutes and a standard deviation of 15 minutes. The time, to the nearest minute, that should be given...
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10/11/17

#### please help thanks!!

The results of an examination are found to be normally distributed with a standard deviation of 15.0. If a student is selected at random, the probability is 0.0485 that his mark will exceed 85. The...
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10/10/17

#### the 95th percentile of a population with mean 235 and standard deviation 25

what is the the 95th percentile of a population with mean 235 and standard deviation 25

10/09/17

#### probability

A student takes a ten-question true-false quiz, but did not study and randomly guesses each answer. Find the probability that the student passes the quiz with a grade of at least 40% of the...
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10/08/17

#### mean of 38000 miles and a standard deviation of 2600 miles. If it guarantees that tires last at least 32540 miles, what % of tires will live up to guarantee?

PLEASE GIVE THE PERCENT OF THE Z-SCORE. ROUND TO TWO DECIMAL PLACES.

10/07/17

#### Mean of 24.3 pounds and standard deviation of 2.3. Find the percentage of 18-month-old girls who weigh more than 29.6 pounds.

Use normal distribution table.

10/07/17

#### results of a certain medical test are normally distributed with a mean of 123 and standard deviation of 14. Find percentage of people with reading above 136.

Use standard normal table

10/07/17

#### Mean is 120 and standard deviation of 15. Find percentage of people with readings between 114 and 126.

Have to use z-score table.

10/07/17

#### Normally distributed with a mean of 587 and a standard deviation of 98. what percentage of scores are at least 600?

I need all work possible.

10/06/17

#### For the standard normal distribution, find the area within one standard deviation

of the mean that is, the area between μ − σ and μ + σ. Round to four decimal places

10/04/17

#### The value of the test statistic is?

The claim is that the proportion of peas with yellow pods is equal to 0.25 (or 25%). The sample statistics from one experiment include 400 peas with 82 of them having yellow pods. Find the value of...
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10/04/17

#### The value of t* for a 95% confidence interval when there were 15 pieces of data is

I don’t understand this and need help please.

10/03/17

#### given the class "10 but less than 20" what are the class boundaries?

If the class is like this
10 but less than 20
20 but less than 30
30 but less than 40
what are the class boundaries

10/01/17

#### If the variance of a data set is 10.32, what is its standard deviation ? Please be accurate to two decimal places.

i need help with these word problems i just do not get them

10/01/17

#### Need answer and explanation!!! PLEASE HELP!

Cans of regular soda have volumes with a mean of 13.46 oz and a standard deviation of 0.12 oz. Is it unusual for a can to contain 13.82 oz of soda?Minimum "usual" value equals = ?.? oz (Type an...
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10/01/17

#### how do I solve this?

74 566 681 852 1173 1262 1552 1645 1762 1846 1860 1946 2038 20y=31.934+(-0.304)x An ecologist uses the line, based on 13 colonies, to predict how many new birds will join another colony, to which...
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10/01/17

#### . What percentage of scores fall between -1 and +1 standard deviation units on a normal curve

How would I come to determine this?

09/28/17

#### If P(B)=0.4, P(A|B)=0.5, P(B′)=0.6, and P(A|B′)=0.7, what is P(B|A)?

Statistics probability problem.
I could really use some help figuring out how to solve this.

09/27/17

#### Find the expected gain or loss.

You buy a lottery ticket to a lottery that costs $10 per ticket. There are only 100 tickets available to be sold in this lottery. In this lottery there are one $485 prize, two $100 prizes, and four...
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