The tail of the distribution trails off to the left, in the direction of the lower, more negative, score values

The large majority of scores are concentrated in the middle of the distribution, and the scores decrease in frequency the father away from the middle

The tail of the distribution trails off to the right, in the direction of the higher, more positive, score values

When researchers draw a smooth curve instead of the series of straight lines in a frequency polygon

14.65 kilowatt-hours

none of the options is correct

14.65 kilowatt-hours²

16.05 kilowatt-hours

9

3

0

6

2,5

3

0,75

4,5

is between 20 and 25 ($10,000s)   

is between 15 and 20 ($10,000s)   

is equal to 50%   

is equal to 30%   

20% of the students scored less than 15 points

20% of the students scored more than 15 points

20% of the students scored 15 points

20% of the students scored less than or equal to 15 points

Convenience sample

Systematic sample

Cluster sample

Stratified sample

Simple random sample

The median will increase, and the mean will stay the same.

The mean will increase, and the median will decrease.

The mean will increase, and the median will stay the same.

Both the mean and median will increase.