you have a normal population of scores with u=60 and o=10. we obtained a random sample...
you have a normal population of scores with u=60 and o=10. we obtained a random sample of n=40. what is the probability that the sample mean will be less than 54?
Homework Answers
Solution :
Given that ,
mean = 
= 60
standard deviation = 
= 10
n = 40
= 60
= /
n = 10 /
40=1.58
P(
< 54) = P[(
-
) /
< (54-60) /1.58 ]
= P(z <-3.80 )
Using z table
probability= 0.0001
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