Lesson 5 Practice

The graph represents the height of males in a particular country in the 20-29 age group. What height represents the 90th percentile?

Interpret the 90th percentile

• This means that 90% of males in this country are taller than this height

• This means that 10% of males in this country are shorter than this height

• This means that 90% of males in this country are shorter than this height

• This means that 90% of males in this country are exactly this height

The data represents the age of 36 executives. Find the percentile that corresponds to the age of 33 years old.

Which z score corresponds with A?

• 0

• 1.44

• -2.17

• none

Which z score corresponds with B ?

• 0

• 1.44

• -2.17

• none

Which z score corresponds with C?

• 0

• 1.44

• -2.17

• none

Which score (if any) would be considered unusual?

• 1.44

• -2.17

• 0

• none

The age of the winners of a cycling tournament are approximately bell-shaped. The mean age is 28.8 years, with a standard deviation of 3.3years. The winner in one recent year was 23 years old. Transform the age to a z -score. (round to two decimal places)

The age of the winners of a cycling tournament are approximately bell-shaped. The mean age is 28.8 years, with a standard deviation of 3.3years. The winner in one recent year was 23 years old. Interpret the z-score. The age of 23 is ______standard deviations _______the mean.

The age of the winners of a cycling tournament are approximately bell-shaped. The mean age is 28.8 years, with a standard deviation of 3.3years. The winner in one recent year was 23 years old.

Determine whether the age is unusual.

• No, this value is not unusual. A z-score outside the range of -2 to 2 is not unusual

• No, this value is not unusual. A z-score between -2 to 2 is not unusual

• Yes, this value is unusual. A z-score outside the range of -2 to 2 is unusual

• Yes, this value is unusual. A z-score between -2 to 2 is unusual