Sixty-five randomly selected car salespersons were asked the number of cars they generally sell in one week. Fourteen people answered that they generally sell five cars; nineteen generally sell six cars; twelve generally sell seven cars; nine generally sell eight cars; eleven generally sell nine cars. Calculate the following. (Round your answer to two decimal places.)

Question

Sixty-five randomly selected car salespersons were asked the number of cars they generally sell in one week. Fourteen people answered that they generally sell five cars; nineteen generally sell six cars; twelve generally sell seven cars; nine generally sell eight cars; eleven generally sell nine cars. Calculate the following. (Round your answer to two decimal places.)
sample mean = x
x =   cars

Arora · Answer

Step 1: Make a frequency distribution table. I will refer to each of the values (number of cars) as x(i) and each of the frequencies as f(i)

Step 2: Finding the mean:

Mean = Σ( x(i)*f(i) ) / (Total number of salespersons)