Based on a sample of restaurants in a large city the

Question

Suppose health inspectors rate sanitation conditions at restaurants on a five point scale, where a 1 indicates poor conditions and a 5 is excellent.

Based on a sample of restaurants in a large city, the frequencies are found to be f₁ = 5, f₂ = 8, f₃ = 20, f₄ = 32, and f₅ = 23. What is the sample size, n? Verify that the sample mean is X‾ = 3.7.