Question 1

In a certain region, the daily high temperature is normally distributed with a mean of 18 degrees and standard deviation of 2.5 degrees. What is the probability the high temperature on any given day is below 15 degrees?

Question 9 options:

0.3849

0.6151

0.8849

0.1151

Question 2

The distance that people travel to work is normally distributed with a mean of 10.2 km and standard deviation of 1.6 km. What is the farthest that 95% of people travel to work?

Question 10 options:

12.832 km

13.336 km

7.568 km

7.064 km

Question 3

The starting annual salaries of students employed at the Vancouver 2010 Winter Olympics is normally distributed with a mean of $6,000 and a standard deviation of $450.What is the probability that a randomly selected student will get a starting salary of at least $5,000?

Question 11 options:

0.987

0.130

0.495

0.500

Question 4

As the sample size increases, the:

Question 12 options:

mean value increases

standard error of the mean decreases

population mean increases

standard error of the mean increases