Question

Lost-time accidents occur in a company at a mean rate of 0.4 per day. What is the probability that the number of lost-time accidents occurring over a period of 9 days will be no more than 5

Answer 1

0.8441

Explanation:

This question can be solved by using the microsoft excel command.

we start off by solvingfor the mean rate for 9 days

mean rate = 0.4

for 9 days = 0.4*9 = 3.6

using the excel command,

POISSON (5, 3.6, TRUE)

p(x≤ 5) = 0.8441

so in conclusion 0.8441 is the probability that lost time accidents over 9 days would not be greater than 5.

the attachment is an excel sheet showing the input and the result.