The frequency table shows the results of a survey asking people how many hours they spent online per week. On a piece of paper,
draw histogram to represent the data. Then determine which answer choice matches the histogram you drew
Hours online
0-3
4-7
8-11
12-15
16-19
Frequency
5
8
10
9
7
Hours online
0-3
4-7
8-11
12-15
16-19
Frequency
5
8
10
9
7
2 answers:
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Let and
. Then
and
The expression under the square root can be rewritten as
Recall that
so that
and assuming and
, we end up with
so that
as required.