Probability & Statistics---Normal Distribution

68% of the marks in a test are between 51 and 64

Assuming this data is normally distributed, what are the mean and standard deviation?

• Mean = 57

  S.D. = 6.5

• Mean = 57

  S.D. = 7

• Mean = 57.5

  S.D. = 6.5

• Mean = 57

  S.D. = 6.5

Tags

CCSS.HSS.ID.A.4

According to the empirical rule, what percentage of data falls within 1 standard deviation?

• 95

• 99.7

• 68

• 25

Tags

CCSS.HSS.ID.A.4

Between what two standard deviations of a normal distribution contain 68% of the data?

• two below and zero

• one below and one above

• two below and two above

• zero and two above

Tags

CCSS.HSS.ID.A.4