The average age of senators in the 108th congress was 57 years. if the standard deviation is 15 z score corresponding to the oldest senator is

The solution for this problem would be:

Since you didn't give the oldest age of the senator, let us assume it is 86 years old.

Now, the z score can be calculated by: z = X - mean / standard deviation.

Plugging in our values:

= 86 - 57 / 15 = 29 / 15 = 1.93333333 is the z score