The Empirical Rule

Find the z-score (rounded to two decimal places):

Joe got a score of 83 when the class average was 71 with standard deviation of 6.5.

Tags

CCSS.HSS.ID.A.4

Find the z-score:

Moe got a score of 88 when the class average was 76 with standard deviation of 7.5.

Tags

CCSS.HSS.ID.A.4

Find the z-score (rounded to two decimal places):

Nielo got a score of 77 when the class average was 72 with standard deviation of 2.3.

Tags

CCSS.HSS.ID.A.4

Find the z-score (rounded to two decimal places):

April got a score of 82 when the class average was 72 with standard deviation of 5.5.

Tags

CCSS.HSS.ID.A.4

Find the z-score:

Max got a score of 82 when the class average was 71 with standard deviation of 5.

Tags

CCSS.HSS.ID.A.4

Find the z-score (rounded to two decimal places):

Alex got a score of 82 when the class average was 72 with standard deviation of 6.

Tags

CCSS.HSS.ID.A.4

500 freshmen at Schaumburg High School took an algebra test. The scores were distributed normally with a mean of 75 and a standard deviation of 7.

What percent of scores are between 61 and 82?

Tags

CCSS.HSS.ID.A.4

500 freshmen at Schaumburg High School took an algebra test. The scores were distributed normally with a mean of 75 and a standard deviation of 7.

What percent of scores are between 75 and 82?

Tags

CCSS.HSS.ID.A.4

500 freshmen at Schaumburg High School took an algebra test. The scores were distributed normally with a mean of 75 and a standard deviation of 7.

What percent of scores are between 61 and 89?

Tags

CCSS.HSS.ID.A.4

500 freshmen at Schaumburg High School took an algebra test. The scores were distributed normally with a mean of 75 and a standard deviation of 7.

What percent of scores are less than 61?

Tags

CCSS.HSS.ID.A.4