An environmental research station recorded the daily particulate matter concentration (in $\mu\text{g/m}^3$ ) near an urban center over a period of $50$ days. The observations are summarized in the table below:
Particulate Matter ( $\mu\text{g/m}^3$ ) Number of Days ( $f$ )
$20 - 29$ $6$
$30 - 39$ $10$
$40 - 49$ $15$
$50 - 59$ $11$
$60 - 69$ $8$
Find the estimated mean particulate matter concentration, in $\mu\text{g/m}^3$ , for the 50-day period.

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An environmental research station recorded the daily particulate matter concentration (in $\mu\text{g/m}^3$ ) near an urban center over a period of $50$ days. The observations are summarized in the table below:

Particulate Matter ( $\mu\text{g/m}^3$ )	Number of Days ( $f$ )
$20 - 29$	$6$
$30 - 39$	$10$
$40 - 49$	$15$
$50 - 59$	$11$
$60 - 69$	$8$

Find the estimated mean particulate matter concentration, in $\mu\text{g/m}^3$ , for the 50-day period.

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45.5

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