SOLUTION: A statistics quiz was normally distributed when a mean quiz score of 45 and standard deviation of 15.
A) what is the probability you scored above a 90?
B) what is the probabil
Algebra.Com
Question 920088: A statistics quiz was normally distributed when a mean quiz score of 45 and standard deviation of 15.
A) what is the probability you scored above a 90?
B) what is the probability that you scored between a 30 and a 75?
Given the same information above,
A) what is probability of getting 82?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
mean = 45 and standard deviation of 15.
A) P(x > 90) = P(z > 3) = normalcdf(3,100)
.........
B) P(x<30) = P(z < -1) and P(x < 75) = P(z < 2)
P (30 < x < 75) = normalcdf(-1,2)
.........
A) P(x = 82) = P(81.95 < x < 82.05) = P(36.95/15 < z < 37.05/15 ) = normal(2.46, 2.47)
RELATED QUESTIONS
A student scored 483 points on a quiz and the students standard or (z) score was -1. the... (answered by stanbon)
I need your assistant please help thank you in advance
An quiz test has a mean of 45... (answered by richwmiller,Fombitz)
a set of data is normally distributed with a mean of 200 and standard deviation of 50.... (answered by richard1234)
For a normally distributed population with a mean =90 and a standard deviation =7, if... (answered by ewatrrr)
how do you get the mean of a quiz score when the student scored 469 and the z score is -3 (answered by reviewermath)
The mean score on a history test was 74.3 and the standard deviation was 5.7. Assuming... (answered by stanbon)
IQ scores of adults are normally distributed with a mean of 100 and a standard deviation... (answered by stanbon,ewatrrr)
The score on the quiz had a mean. Of 7.0 and standard devotion of 1.0 what is the... (answered by ewatrrr)
The scores on a statistics test were normally distributed with a mean of 78 and a... (answered by Theo)