843 Answered Questions for the topic Statistics Question

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

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... more

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... more

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... more

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... more

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

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... more

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... more

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

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... more

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

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... more

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. 

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

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

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... more

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... more

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

How would I come to determine this?

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.

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... more
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