Value of Z and Value of X based on Probability

1. For some positive value of Z, the probability that a standard normal variable is between 0 and Z is 0.3770. The value of Z is
a) 0.18
b) 0.81
c) 1.16
d) 1.47

2. For some positive value of X, the probability that a standard normal variable is between 0 and +2X is 0.1255. The value of X is
a) 0.99
b) 0.40
c) 0.32
d) 0.16

don't use excel please. i need formula explanation. Thanks.

Solution Summary

Statistics MCQ: This posting contains 2 statistics multiple choice questions.