Calculus and Above

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1. A math teacher gives two different tests to measure
1. A math teacher gives two different tests to measure students' aptitude for math. Scores on the first test are normally distributed with a mean of 24 and a standard deviation of 4.5. Scores on the s… read more
Sandhya_sharma
Master's Degree
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ATTENTION RYAN:STASTIC HOMEWORK1. The amount of Jen's
Attachment: 2015-05-12_195353_exam_4_stastic.docx ATTENTION RYAN: STASTIC HOMEWORK 1. The amount of Jen's monthly electric bill is normally distributed with a mean of \$160 and a standard deviation of … read more
Ryan
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Question 1 of 20 5.0 Points The lifetimes of light bulbs of
Question 1 of 20 5.0 Points The lifetimes of light bulbs of a particular type are normally distributed with a mean of 270 hours and a standard deviation of 11 hours. What percentage of the bulbs has l… read more
Ryan
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Bachelor's Degree
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I am working on a statistics worksheet and struggling with understanding how some of it is
I am working on a statistics worksheet and struggling with understanding how some of it is done. This is the worksheet. 12. For the following scores, find the mean, median, sum of squared deviations, … read more
Ryan
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Bachelor's Degree
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I need my statistics homework checked. I am not sure I understand
I need my statistics homework checked. I am not sure I understand the normal curve correctly. Homework questions below: Apply It #4: Using the 50%-34%-14% approximations of areas under the normal curv… read more
Ryan
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1.)The claim is the proportion of peas with yellow pods is
1.)The claim is the proportion of peas with yellow pods is equal to 0.25(0r 25%). The sample statistics from one experiment include 530 peas with 113 of them having yellow pods. Find the value of the … read more
R.R. Jha
Bachelor's Degree
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Q2 (b) The pulse rates of healthy adults are normally distributed with mean 72 and standard deviation of 5. i) Approximately ninety-ﬁve percent of the adult population can be said to have their pulse … read more
Rajan.Sareen
Sr. Statistician
Master's Degree
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Trying to determine t-test value (one-tailed test) to see if
Trying to determine t-test value (one-tailed test) to see if performance improved on a math test due to peer tutoring. The 18 students took a test after regular teaching instruction and their scores w… read more
Rajan.Sareen
Sr. Statistician
Master's Degree
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A grocery stores receipts show that customer purchases have
A grocery store's receipts show that customer purchases have a skewed distribution with a mean of \$40 and a standard deviation of \$30. a. explain why you cannot determine the probability that the next… read more
SusanAthena
Master's Degree
Master's Degree
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1) A set of 50 data values has a mean of 27 and a variance
1) A set of 50 data values has a mean of 27 and a variance of 16. I. Find the standard score (z) for a data value = 19. II. Find the probability of a data value < 19. 2) Find the area under the sta… read more
Math-John
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I. a. What percentage of the area of the standard normal distribution
I. a. What percentage of the area of the standard normal distribution is between z = -2.00 and z = +2.00? How do you know this? b. Find the following: P(z > 2.43) II. 1. A set of 50 data values has… read more
Chirag
Master's Degree
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1. A set of 50 data values has a mean of 44 and a variance
1. A set of 50 data values has a mean of 44 and a variance of 16. I. Find the standard score (z) for a data value = 51. II. Find the probability of a data value < 51. 2. Find the area under the sta… read more
Scott
Master's Degree
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The distribution of heights of young men is approximately Normal
The distribution of heights of young men is approximately Normal with mean 70 inches and standard deviation 2.5 inches. Use 68-95-99.7 rule to answer the following questions. a. what % of men are tall… read more
Ryan
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Bachelor's Degree
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Hello Greg, I have more work if you want. 1. Consider a
Hello Greg, I have more work if you want. 1. Consider a population with and (A) Calculate the z-score for from a sample of size 14. (B) Could this z-score be used in calculating probabilities using Ta… read more
Mr. Gregory White
Master's Degree
Master's Degree
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To susan athena 1) an incoming freshman took her schools placement
To susan athena 1) an incoming freshman took her schools placement exams in french and mathematics. in french, she scored 82 and in math she scored 86. the overall result on the french exam had a mean… read more
SusanAthena
Master's Degree
Master's Degree
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Hi Greg, I have another assignment if you want it. Please
Hi Greg, I have another assignment if you want it. Please show the work. It's more intro statistics stuff. 1. A set of 50 data values has a mean of 30 and a variance of 4. I. Find the standard score (… read more
Mr. Gregory White
Master's Degree
Master's Degree
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22e. Suppose that you were assigned to write an article for
22e. Suppose that you were assigned to write an article for the student newspaper and you were given a quota ( by the editor) of interviewing at least three extroverted professors. How many professors… read more
R.R. Jha
Bachelor's Degree
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The amount of time it takes to recover physiologically from
The amount of time it takes to recover physiologically from a certain kind of sudden noise is found to be normally distributed with a mean of 80 seconds and a standard deviation of 10 seconds. Using t… read more
Stevewh
Teacher
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