Red Street Garage has 9 used cars for sale. Fairwheel Garage has 15 used cars for sale. The mean age of the cars in Red Street Garage is 3.6 years and the standard deviation is 1.925 years. In Fairwheel Garage, $\sum {x = 64} $ and $\sum {{x^2} = 352} $, where $x$ is the age of a car in years.
a) Find the mean age of all 24 cars.
b) Find the standard deviation of the ages of all 24 cars.
پاسخ تشریحی :
تحلیل ویدئویی تست
منتظریم اولین نفر تحلیلش کنه!