Question

Statistics , urgent ! !

Please help me solve Part e) from this ! ! !

https://www.dropbox.com/s/osivn8xozp5wrje/Screenshot%202015-05-25%2013.56.28.jpg?dl=0

and the table (if needed):
https://www.dropbox.com/s/ten677798g1i5fu/Tables%201%202%203.pdf?dl=0

Answer 1

I think they want the x where 25% of the area under the curve is to the left of x.
From the your standard normal cumulative distribution table, that occurs at about -0.67 std dev below the mean.

Answer 2

I just found out the solution. Thanks!

Answer 3

with a mean of 70 and variance of 100 (std dev = 10)
you should get 70 - 0.67*10 or about 63.3