Question

In: Math

Assume that a set of test scores is normally distributed with a mean of 120 and...

Assume that a set of test scores is normally distributed with a mean of 120 and a standard deviaton of 5. Use the 68-95-99.7 rule to the find the followng quantities.

a. The percentage of scores less than 120 is ____% (round to one decimal place as needed).

b. The percentage of scores greater than 125 is ______% (round to one decimal place as needed).

c. The percentage of scores between 110 and 125 is ____% (round to one decimal place as needed).

Solutions

Expert Solution

for any query please comment below.thank you

milcah answered 1 year ago
Next > < Previous

Related Solutions

Assume that a set of test scores is normally distributed with a mean of 80 and...
Assume that a set of test scores is normally distributed with a mean of 80 and a standard deviation of 15 Use the​ 68-95-99.7 rule to find the following quantities. a. The percentage of scores less than 80 is ___%. ​(Round to one decimal place as​ needed.) b. The percentage of scores greater than 95 is ___​% ​(Round to one decimal place as​ needed.) c. The percentage of scores between 50 and 95 is ___​%. ​(Round to one decimal place...
A set of test scores is normally distributed. If 80% of the scores are above 90...
A set of test scores is normally distributed. If 80% of the scores are above 90 and 30% of the test scores are below 70%, what are the mean and standard deviation of the distribution?
Ralph’s bowling scores in a single game are normally distributed with a mean of 120 and...
Ralph’s bowling scores in a single game are normally distributed with a mean of 120 and a standard deviation of 10. Lucky Lolly’s bowling scores in a single game a normally distributed with a mean of 100 and standard deviation of 15. Is Lolly or Ralph more likely to score over 165 in a single game? Show your work. Is Lolly or Ralph more likely to score over 130 in a single game? Show your work.
Suppose that scores on a test are normally distributed with a mean of 80 and a...
Suppose that scores on a test are normally distributed with a mean of 80 and a standard deviation of 8. Which of the following questions below are of type B? a. Find the 80th percentile. b. Find the cutoff for the A grade if the top 10% get an A. c. Find the percentage scoring more than 90. d. Find the score that separates the bottom 30% from the top 70%. e. Find the probability that a randomly selected student...
The scores on a math test are normally distributed with a mean of 74 and a...
The scores on a math test are normally distributed with a mean of 74 and a standard deviation of 8. The test scores range from 0 to 100. Seven students had test scores between 82 and 98. Estimate the number of students who took the test.
Suppose that scores on a test are normally distributed with a mean of 80 and a...
Suppose that scores on a test are normally distributed with a mean of 80 and a standard deviation of 8. Determine the score that would be considered the first/lower quartile (??)
Test scores on a university admissions test are normally distributed, with a mean of 500 and...
Test scores on a university admissions test are normally distributed, with a mean of 500 and a standard deviation of 100. d. 20% of test scores exceed what value? i know P(X>= c-500/100) = .20 but after this, i dont understand why c -500/100 =.84 where did this .84 come from?
Suppose that student scores on creativity test are normally distributed. The mean of the test is...
Suppose that student scores on creativity test are normally distributed. The mean of the test is 150 and the standard deviation is 23. Using a z-table (normal curve table), what percentage of students have z-scores a) below 1.63 b) above -0.41 Using a z-table, what scores would be the top and bottom raw score to find the c) middle 50% of students d) middle 10% of students Using a z-table, what is the minimum raw score a student can have...
The scores on a standardized test are normally distributed with a mean of 95 and standard...
The scores on a standardized test are normally distributed with a mean of 95 and standard deviation of 20. What test score is 0.5 standard deviations above the mean?
scores on the test are normally distributed with a mean of 76.4 and a standard deviation...
scores on the test are normally distributed with a mean of 76.4 and a standard deviation of 8.9. round answer nearest whole number. A. top 90% to 100% of scores b. scores below the top 90 % and above top 70% c. scores equal or below 70%and above the bottom 30% d. scores equal or below 30% snd above bottom 10%
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT