Please select the correct answer choice for questions 1 and 2 (explanation would also be appreciated) :

1) Given that Z is a standard normal random variable, what is the value of Z if the area between -Z and Z is 0.901?

a.1.96

b.-1.96

c.0.4505

d.1.65

2) If the random variableXis exponentially distributed, then the mean ofXwill be:

a. greater than the median.

b. less than the median.

c. equal to the median.

d. Cannot tell; the answer depends on whatis.