Question

The table below indicates the cost of certain air tel kiosk

Z 0.15 0.20 0.25 0.75 0.80 0.85 1.85 1.90 1.95 2.00 2.05

Фz 0.0596 0.0793 0.0987 0.2734 0.2881 0.3023 0.4678 0.4713 0.4744 0.4772 0.4798

If it was stated that, the number of telephone calls received at a switchboard is approximately normal with a mean of 580 calls and a standard deviation of 10.
REQUIRED
Find the possibility that on a given day the number of calls received at the
switchboard will be;
(a) Exactly 578
(b) Less than 57
(c) Between 561 and 600 inclusive

Answer 1

Answer:

answer is c between 561 and 6ó0 inclusive