A set of quiz scores is shown in the histogram below. The mean of the data set is 20.2, and the (population) standard deviation
is 2.4.
PLEASE PLEASE PLEASE How many numbers in the data set are within 1 standard deviation of the mean?
13
14
15
16
PLEASE PLEASE PLEASE How many numbers in the data set are within 1 standard deviation of the mean?
13
14
15
16
1 answer:
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Answer:
The correct options are (1), (3) and (5).
Step-by-step explanation:
The two triangles are shown below.
The measure of ∠F corresponds to ∠F'.
The distance between the points D and origin is of 9 units.
And the distance between the points D' and origin is 3 units.
Thus, the distance from point D' to the origin is One-third the distance of point D to the origin.
Check for similarity:
Thus, the △DEF is similar to △D'E'F'.
Thus, the correct options are (1), (3) and (5).
