The number of accidents per week at a hazardous intersection varies with mean 2.2 and standard deviation of 1.4. The distribution takes only integers and most definitely not normal. Let x-bar be the mean of accidents per week at the intersection during one year (52 weeks). What is the approximate probability that x-bar is less than 2

Approximate probability that is less than 2 = 0.1515

Step-by-step explanation:

Given -

Mean = 2.2

Standard deviation = 1.4

Sample size ( n ) = 52

Let   be the mean of accidents per week at the intersection during one year (52 weeks) .

probability that is less than 2 =

 =   Putting

                 =    ( Using Z table )

                 = 0.1515

the correct is answer is a 9-sided polygon!