Question

PLS HELP!

These line plots show the number of minutes two different age groups of teenagers spent online the previous week.

Two line plots, both are labeled from twelve to thirty six going by ones underneath the line plot. The top line represents Hours spent online parenthesis ages thirteen to fifteen parenthesis. There are three Xs over twenty eight, two Xs over twenty seven and one X over twenty one, twenty four, twenty six, thirty one and thirty four. The bottom line represents Minutes spent online parenthesis ages sixteen to eighteen years old parenthesis. There are four Xs over twenty eight and one X over twelve, twenty one, twenty seven, thirty point five, thirty four, thirty five and thirty six.

Select from the drop-down menus to complete each statement.

The range is:
A) is greater for data set 1 (13- to 15- year olds)
B) is greater for data set 2 (16- to 18- year olds)
C) is the same for both sets of data.

The mean is:
A) is the same for both sets of data
B) is greater for data set 1 (13- to 15- year olds)
C) is greater for data set 2 (16- to 18- year olds)

Pls help!

Answer 1

Range: B

Mean: C

Explanation:

Range is the greatest number in a data set minus the smallest number. For the first data set, 34-21=13. For the second, 36-12=24. Therefore, the range for the second set is greater.

As for mean, you have to add all of the values up, and then divide them by the number of values there are.

For data set 1 : 28+28+28+27+27+21+24+26+31+34= 274. There are 10 data points, and 274/10=27.4.

For data set 2: 28+28+28+28+12+21+27+30.5+34+35+36= 307.5. There are 11 data points, and 307.5/11= 27.95

Therefore, data set 2 also has a greater mean, even if only slightly.