Monthly Water Bills
Jan
Feb Mar
X₁
k
X₂
$40
$42
$40
Apr
X₁
$38
May
June July Aug Sept
x₂
Xo
X₁
X₁
X₂
$48 $50
$58 $62
$56
Oct Nov Dec
X10
X₁1
$40 $44
X₁₂
$44
6. Write the formula for the mean water bill for the entire year using sigma
notation and determine that mean. Round your answer to the nearest cent.