Answer:
Step-by-step explanation:
Given that the random variable X is normally distributed, with
mean = 50 and standard deviation = 7.
Then we have z= 
Using this and normal table we find that
a) 
b) When z=0.02
we get

c) 90th percentile z value =1.645
90th percentile of X 
Answer:
x=2
Step-by-step explanation:
Answer:
Only option (A) is incorrect.
So , true statements are (B), (C) &(D).
#$# THANK YOU #$#
Answer: the answer is 0
Step-by-step explanation: