Dot Plots and Measures of Center

Find the median of the data set.

{57, 59, 64, 72, 76, 77, 77, 78, 85, 87, 88, 88, 88, 92, 94, 96, 98, 100}

• 82

• 86

• 88

• 92

Find the mean of the data set.

{57, 59, 64, 72, 76, 77, 77, 78, 85, 87, 88, 88, 88, 92, 94, 96, 98, 100}

• 82

• 86

• 88

• 92

Find the mode of the data set.

{57, 59, 64, 72, 76, 77, 77, 78, 85, 87, 88, 88, 88, 92, 94, 96, 98, 100}

• 82

• 86

• 88

• 92

Find the interquartile range (IQR) of the data set.

{57, 59, 64, 72, 76, 77, 77, 78, 85, 87, 88, 88, 88, 92, 94, 96, 98, 100}

• 76

• 43

• 16

• 92

If the lowest 25% of test scores must retest, which range represents those who must retest?

Test Scores:

{57, 59, 64, 72, 76, 77, 77, 78, 85, 87, 88, 88, 88, 92, 94, 96, 98, 100}

• 57-76

• 76-86

• 86-92

• 92-100

Which is NOT in the middle 50% of data values?

• 17

• 15

• 21

• 11

If 44 values were used for the data, about how many data values are greater than the 1st quartile?

• 11
• 22
• 33
• 128

About 50% of the data values are greater than what value?

• 12

• 15

• 22

• 31

Which value is in the top 25% of the data?

• 16
• 22
• 29
• 36

True or false: 75% of the data values are greater than 18.

• True

• False, 75% of the values are greater than 16

• False, 50 % of the values are greater than 18

• False, 25% of the values are greater than 18