Question

Urgent please help. Amanda surveyed 20 juniors and seniors at delamar high school to find the number of hours per week they spend working at part-time jobs. Her results are shown below.

Look at picture

Answer 1

The correct statement is (C).

Explanation:

The data for the number of hours per week they spend working at part-time jobs by 20 juniors and seniors at Delmar high school is:

Juniors: 20, 10, 20, 10, 15, 0, 0, 10, 20, 15

Seniors: 20, 20, 10, 10, 0, 0, 0, 10, 0, 10

Compute the mean of both the data:

`\mu_(J)=(1)/(n)\sum\limits^(n)_(i=1){x_(iJ)}`

`=(1)/(10)* [20+10+20+10+15+0+0+10+20+15]\\\\=(120)/(10)\\\\=12`

`\mu_(S)=(1)/(n)\sum\limits^(n)_(i=1){x_(iS)}`

`=(1)/(10)* [20+ 20+10+10+0+0+0+10+0+10]\\\\=(80)/(10)\\\\=8`

Compute the range of both the data:

`Range_(J)=Max._(J)-Min._(J)`

`=20-0\\=20`

`Range_(S)=Max._(S)-Min._(S)`

`=20-0\\=20`

It can be seen that the range of both the data is same, i.e. 20.

Thus, the correct statement is (C).