Question

Joe Doe trucking has 356 customer reviews, rating the company on a 1 to 5 star rating. What is the likelihood the company as an overall rating of 5 stars?

Answer 1

Solution:-

The likelihood the company as an overall rating of 5 stars is less than 0.00001.

n = 356

p = 1/5

p = 0.20

By applying binomial distribution:-

P(x,n) = ⁿC_x*p^x*(1-p)^(n-x)

P(x = 5) = ³⁵⁶C₅*(0.20)⁵*(1 - 0.20)^{(356 - 5)}

P(x = 5) = less than 0.00001