Question

5. A violinist practices one hour a day from Monday through Friday. How many hours must she practice on Saturday

order to have an average (antharctic meani ot two hours a day for the six day period?
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Answer 1

must practice 7 hours on Saturday

Explanation:

Let 'x' = number of hours on Saturday

(5 (hours) + x) / 6 (days) = 2

`(5+x)/(6)` =
`(2)/(1)`

Cross-multiply to get 5 + x = 12

Answer 2

7 hours

Explanation:

First find the total number of hours she practices based on the average of 2 hours a day for six days.

This means 6*2 = 12 , she practices a total of 12 hours.

Next find the total hours she already practiced. She practices 1 hour a day from Mon to Fri, which is 5 days, so 1*5 = 5 hours. This is the hours she practiced already.

To meet the mean, she needs to practice 12-5 = 7 hours more on Saturday.

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