2-5 Finding area under a normal curve

Assuming a normal distribution, what percentage of 250 g coffee packs are underweight if the mean weight is 255 g and the standard deviation is 2.5 g?

Assuming a normal distribution with a mean of 42% and a standard deviation of 8%, what percentage of students pass a test if they need 50% or more?

Population ages in Meru, Ipoh are Normally distributed with mean 43 and standard deviation 14. Population: 5,000. How many are aged between 22 and 57?

Z-score for 40 yards sprint time of 5.6 seconds (mean = 5.2, SD = 0.3)?

Z-score for a 40 yards sprint time of 4.6 seconds (mean = 5.2s, SD = 0.3s)

The mean number of accidents a week at a company is 6.4 with a standard deviation of 1.5. What proportion of weeks would you expect to have less than 5 accidents?

Mean number of accidents a week: 6.4, Standard deviation: 1.5. What proportion of weeks have more than 7 accidents?

The mean GPA of students in a course at UCDavis is 3.2 with a standard deviation of 0.3. What percent of students in the course have a GPA between  2.9 and 3.8?  Options: 81.9%, 47.5%, 68%, 95%

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

The average waist size for teenage males is 29 inches with a standard deviation of 1.4 inch. If waist sizes are normally distributed, estimate the proportion of teenagers who will have waist sizes greater than 31 inches?