A certain standardized test has scores which range from 0 to 500, with decimal s
ID: 3207452 • Letter: A
Question
A certain standardized test has scores which range from 0 to 500, with decimal scores possible. Scores on the exam are normally distributed with a mean of 321 and a standard deviation of 47.
Find the percentile P67 for the scores of students taking the exam.
Round your answer to 2 decimal places.
A quiz worth 5 points is given to a statistics class. Let X represent the score of a randomly selected student in the class. The probability distribution for X is given below.
Find the missing value, K.
Find the standard deviation of the score.
x 0 1 2 3 4 5 P(x) 0.06 0.12 0.19 0.23 K 0.14Explanation / Answer
mean is 321 and sd= 47 for the normal distribution
P(x>X)=0.67
from normal distribution table, this gives a z value of 0.44
thus (x-321)/47 =0.44
x=0.44*47+321 =341.68
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