If x has a normal distribution with mean 80 and standard deviation 5 then the 90th percentile of x is 70.
A normal distribution with mean 80 and standard deviation 5
We need to find the 90th percentile of x
Computing values to standard deviation from mean,
Lower limit = mean - 2s
= 80 - 2(5)
= 80 - 10
Lower limit = 70
Hence, if x has a normal distribution with mean 80 and standard deviation 5 then the 90th percentile of x is 70.
To learn more about standard deviation refer here
brainly.com/question/12402189
#SPJ4
