7.1 Team Challenge (B)

Given that a set of data with a normal distribution has a mean of 20.3 and standard deviation of 4.1. 68% of the data falls between what two values?

• (20.3, 28.5)

• (12.1, 24.4)

• (16.2, 24.4)

• (16.2, 28.5)

Tags

CCSS.HSS.ID.A.4

A radar unit is used to measure speeds of cars on a motorway. The speeds are normally distributed with a mean of 85 km/hr and a standard deviation of 10 km/hr. What percent of the speeds measured are greater than 95 km/hr?

• 16%

• 27%

• 34%

• 47.5%

Tags

CCSS.HSS.ID.A.4

A large group of students took a test in Physics and the final grades have a mean of 80 and a standard deviation of 10. If we can approximate the distribution of these grades by a normal distribution, what percent of the students failed (< 60) or got a "A" (> 90)?

• 4.7%

• 18.5%

• 13.5%

• 27%

Tags

CCSS.HSS.ID.A.4

Given that a set of data with a normal distribution has a mean of 20.3 and standard deviation of 4.1. What percent of the data is inside the range 12.1 to 32.6?

• 68%

• 81.5%

• 95%

• 97.35%

Tags

CCSS.HSS.ID.A.4