Caitlyn sold 7cars per week for the first three weeks, but in week four she sold 11 cars. What is her average number of sales per week in her first four week on the job?
A) 7
B) 8
C) 9
D) 11
E) 12
Please explain! Thanks!
7 + 7 + 7 + 11 = 32
32/4 = ?
http://www.mathsisfun.com/mean.html
Three weeks is 7*3= 21 cars
In week four is 11* 1 = 11 cars
Add/n
(21+11)/4
32/4 = 8
To calculate Caitlyn's average number of sales per week in her first four weeks on the job, we need to find the total number of cars she sold and divide it by the number of weeks.
First, let's find the total number of cars Caitlyn sold.
In the first three weeks, she sold 7 cars per week, so the total number of cars sold in the first three weeks is 7 x 3 = 21 cars.
In week four, she sold 11 cars.
To find the total number of cars sold in the first four weeks, we add the number of cars sold in the first three weeks to the number of cars sold in week four: 21 + 11 = 32 cars.
Finally, to find the average number of sales per week, we divide the total number of cars sold by the number of weeks, which is 32 / 4 = 8 cars.
Therefore, Caitlyn's average number of sales per week in her first four weeks on the job is 8 cars.
So the correct answer is B) 8.