The average rating of a public senior high school students in a certain division of region VII is 85 with a standard deviation of 3.If a student is selected, what is the probability that his average rating is greater than 80?
Answers
Given : The average rating of a public senior high school students in a certain division of region VII is 85 with a standard deviation of 3.
a student is selected,
To Find : the probability that his average rating is greater than 80
Solution:
Mean = 85
SD = 3
Value = 80
Z score = ( Value - Mean ) /SD
=> Z score = ( 80 - 85)/3 = - 5/3 = - 1.667
From Z score table : 0.0478 are less than 80
probability that his average rating is greater than 80 = 1 - 0.0478
= 0.9522
0.9522 is the probability that his average rating is greater than 80
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