Given a table represents the monthly cell phone bills.
We will find the mean cell phone bill from March to September
Mean = The sum divided by the number
We will find the sum using the sigma notation as follows:
[tex]sum=\sum_{n\mathop{=}3}^9x_n=78+82+95+87+90+76+88=596[/tex]
And the number of the months from March to September = 7
So, the mean will be as follows:
[tex]Mean=\frac{596}{7}=85.142857[/tex]
Rounding to the nearest cent.
So, the answer will be:
Mean = 85.14
