Question

A message center receives calls from 6 p.m. until 6 a.m. Typically, 50% of the calls come in between 6 p.m. and 9 p.m.; 25% of the calls come in between 9 p.m. and midnight; 20% of the calls come in between midnight and 3 a.m.; and 5% of the calls come in between 3 a.m. and 6 a.m.

What is the probability that a call will come in between 6 p.m. and midnight?

Question 5 options:

25%


50%


55%


75%

Answer 1

Midnight to 3 a.m.: 20%
3 a.m. to 6 a.m. 5%

Midnight to 6 a.m. = 20% + 5% = 25%