Central limit theorem question?
Less than 16,000 kwh
Less than 15,000 kwh
As population mean = 16939 n=53 SD=3500 sample SD=480.76197
I got p(z<16000)=-1.95 0.4744 0.5-04744=0.02560
but it is not correct
and if the sample mean is less than 15000, z score= -4.03318 the number is not on the data.
How can I solve this question? help me please