Question

The hand spans, to the nearest cm, of some students in a class are shown below: 19, 22, 21, 15, 18, 22, 17, 19, 16, 21, 19, 18, 22, 20, 21, 22, 19, 15, 17, 21 Henry created the following incorrect dot plot to represent the data: Dot plot showing 2 dots over 15, 1 dot over 16, 2 dots over 17, 2 dots over 18, 4 dot over 19, 1 dot over 20, 5 dots over 21, and 4 dots over 22 What should Henry do to make the dot plot correct?

Answer 1

Your Answer is D, delete 1 dot on 21.

Answer 2

He should remove one dot over 21 so that the actual data plot and his data plot matches.

Explanation:

We are given a set of data points as:

19, 22, 21, 15, 18, 22, 17, 19, 16, 21, 19, 18, 22, 20, 21, 22, 19, 15, 17, 21

on making the frequency table of these data points.

Hand span(cm) Frequency

15 2

16 1

17 2

18 2

19 4

20 1

21 4

22 4

Hence, when we will make the dot plot of it then:

There must be:

2 dot over 15

1 dot over 16

2 dot over 17

2 dot over 18

4 dot over 19

1 dot over 20

4 dot over 21

and 4 dot over 22

But according to Henry it was given:

2 dots over 15

1 dot over 16

2 dots over 17

2 dots over 18

4 dot over 19

1 dot over 20

5 dots over 21

and 4 dots over 22

Hence, Henry should remove one dot over 21 in order to get the correct dot plot.