The mean is the average of a set of numbers. So to do that:
add all the numbers 120+235+98+142=$595
Then divide that by the total number in the set, in this case it is 4.
$595/4= $148.75 assuming that the prices given are the final price of the job.
Cos35= y/15
y= 15cos35
y= 12.3 cm
Answer:
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188 minutes (rounded) or 187 minutes and 5 seconds