Carry your intermediate computations to at least four decima

Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.

Solution

mean = 0.10 ; std deviation = 0.07/sqrt40 =0.011

Z = x-mean/std deviation = ( 0.09 -0.10)/( 0.011) = -0.909

P( x>=z) = P(x>= -0.909) = 0.81835

=0.818 ( from dtandard normal distribution table or calculator)