The test scores on a 100-point test were recorded for 20 students.

61	96	94	86	58	63	86	82	76	57
94	89	67	62	77	87	68	65	75	84

Construct a relative frequency distribution for the data, using 6 classes of width 8, and starting at 52. Then answer the question.

A histogram has a horizontal axis labeled "test score" with values from 0 to 100 and a vertical axis labeled "Frequency" with values from 0.00 to 0.26. The histogram has 6 bars of equal width. Each bar is associated with an interval and an approximate value as listed below.

• 52 to 60: 0.10
• 60 to 68: 0.10
• 68 to 76: 0.15
• 76 to 84: 0.15
• 84 to 92: 0.25
• 92 to 100: 0.25

A histogram has a horizontal axis labeled "test score" with values from 0 to 100 and a vertical axis labeled "Frequency" with values from 0.00 to 0.26. The histogram has 6 bars of equal width. Each bar is associated with an interval and an approximate value as listed below.

• 52 to 60: 0.10
• 60 to 68: 0.15
• 68 to 76: 0.25
• 76 to 84: 0.25
• 84 to 92: 0.15
• 92 to 100: 0.10

A histogram has a horizontal axis labeled "test score" with values from 0 to 100 and a vertical axis labeled "Frequency" with values from 0.00 to 0.26. The histogram has 6 bars of equal width. Each bar is associated with an interval and an approximate value as listed below.

• 52 to 60: 0.10
• 60 to 68: 0.25
• 68 to 76: 0.10
• 76 to 84: 0.15
• 84 to 92: 0.25
• 92 to 100: 0.15

A histogram has a horizontal axis labeled "test score" with values from 0 to 100 and a vertical axis labeled "Frequency" with values from 0.00 to 0.26. The histogram has 6 bars of equal width. Each bar is associated with an interval and an approximate value as listed below.

• 52 to 60: 0.25
• 60 to 68: 0.25
• 68 to 76: 0.15
• 76 to 84: 0.15
• 84 to 92: 0.10
• 92 to 100: 0.10

Is the shape of the distribution unusual?The shape is not unusual because we should expect the distribution to be mound-shaped.The shape is unusual because we should expect the distribution to be mound-shaped. Can you think of any reason the distribution of the scores would have such a shape?