Answer:
Mean = 90.67
Explanation:
The three consecutive month periods with the highest monthly cell phone bills are:
May, June, July
May, x₅ = $95
June, x₆ = $87
July, x₇ = $90
The mean of the three consecutive month periods with the highest mean of the year is calculated below
[tex]\begin{gathered} Mean=\frac{\sum x_{567}}{3} \\ \\ Mean=\frac{x_5+x_6+x_7}{3} \\ \\ Mean=\frac{95+87+90}{3} \\ \\ Mean=\frac{272}{3} \\ \\ Mean=90.67 \end{gathered}[/tex]
