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7-169.

During the semester, Arezo’s daily calculus grade at time, $t$ (in days), is given by $G(t) = 0.008t^2 + 22 \sin( \frac { t } { 5 } )+ 45$ . She will receive $50$ if she passes calculus, which requires an average grade of $60$% or better. If her semester grade (over $18$ weeks) is the average grade during that time period, should she celebrate? Homework Help ✎

$18 \times 7 = 126$ days

Find the average value of $G(t)$, given $G(t)$.