An independent third party found the cost of a basic car repair service for a local magazine. The mean cost is $217.00 with a standard deviation of $11.40. Which of the following repair costs would be considered an “unusual” cost?

Question

Vocaloid · Answer

Hm. Hard to answer without knowing the choices

However the typical approach would be to use the standard deviation and mean to calculate the 95% confidence interval and see which value(s) lie outside the range