Use the following table to answer questions 5-8. Monthly Cell Phone Bills
May
June July Aug Sept
Jan
Feb
Mar
Apr
Oct
Nov
Dec
X4
X's
Xo
X
Xg
X10
X12
$83
$86
$78
$82
$95
$87
$90
$76
$88
$82
$83
$71
5. Write the formula for the mean cell phone bill for the entire year using sigma notation and
determine that mean. Round your answer to the nearest cent.

step-by-step explanation:

sry but any answer choices

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

7 is the median   7.875 is the mean

step-by-step explanation:

3,4,5,6,8,11,13,13