Normal Calculations Practice

The weights of paper discarded each week by households are normally distributed with a mean of 9.43 pounds and a standard deviation of 4.17 pounds. What percent of households discard between 10 and 12 pounds?

• 17.68%

• 6.50%

• 28.55%

• 82.32%

The weights of paper discarded each week by households are normally distributed with a mean of 9.43 pounds and a standard deviation of 4.17 pounds. What percent of households throw out fewer than 2 pounds of paper each week?

• 96.26%

• 48.13%

• 3.74%

• 1.87%

Tags

CCSS.HSS.ID.A.4

Heights of women are normally distributed with a mean of 63.6 inches and a standard deviation of 2.5 inches.  The Beanstalk Club, a social organization for tall people, has a requirement that women must be at least 70 inches tall. What percentage of adult women meets the requirement to join the club?

• 0.52%
• 5%
• 99.48%
• 95%

Tags

CCSS.HSS.ID.A.4

The lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. What percent of pregnancies will last fewer than 8 months (approximately 240 days)? 

• 13.14%
• 96.9%
• 86.86%
• 3.10%

Tags

CCSS.HSS.ID.A.4

Pat and Chris both took a spatial abilities test (mean = 80, std. dev. = 8).  Pat scores a 76 and Chris scored a 94.  What percent of individuals would score between Pat and Chris? 

• 26.8%
• 96%
• 65.1%
• 4%

Tags

CCSS.HSS.ID.A.4

Why is the highest part of the normal curve in the middle? 2 answers

• Most people tend to fall around the average

• data is never skewed left or right

• when you square things, they always end up in the middle

• the further from the mean, the less likely something is

What is standard deviation?

• good question

• how standardly something deviates

• average distance that data points are from the average

• Idk but I should probably find out pretty soon

What percent of people are 3 standard deviations above the mean?

• .15%

• 34%

• 68%

• 2.35%

What percent of people within 1 standard deviation of the mean?

• 99.7%

• 34%

• 68%

• 95%

Tags

CCSS.HSS.ID.A.4

What percent of people within 2 standard deviations of the mean?

• 99.7%

• 34%

• 68%

• 95%

Tags

CCSS.HSS.ID.A.4