Population mean, = 75
Population standard deviation, = 11
Sample size, n = 36
According to Central Limit Theorem, P( < A) = P(Z < (A - )/)
= = 75
=
=
= 1.8333
P(mean score is greater than 81), P( > 81) = 1 - P( < 81)
= 1 - P(Z < (81 - 75)/1.8333)
= 1 - P(Z < 3.27)
= 1 - 0.9995
= 0.0005
Get Answers For Free
Most questions answered within 1 hours.