Stats Unit

The weights of two-year old humans are normally distributed with a mean of 25 pounds and a standard deviation of 4 pounds. Which range of values represents 68% of two year old baby weights?

• 24-26

• 22-28

• 21-29

• 17-33

The average price of an uber ride is $12.50 and teh standard deviation is $6. What percent of uber rides cost more than $20?

• 10.56%

• 89.41%

• 13.5%

• Not enough information

A uniform distribution has a range of 5. What is the height of the distribution?

• 5

• .2

• .1

• .5

The IQR of the standard normal curve is 

• .67

• .5

• 1.35

• 1

A poll was taken of 121,973 people in the United States aged 15-44 to determine their health insurance status. The participants were classified by gender and by type of insurance coverage. The results were as follows. A person is selected at random. Compute the following probability: The person has private insurance or medicaid.

• .8417

• .0781

• .7657

• .6876

Find the median of plot B

• 30

• 14

• 28

• 16

Mustafa is pulling marbles out from a bag. The probablity for certain colours are as follows are in the table above. If there are 100 marbles, how many will be purple?

Which car club has the higher median?

• Cruisers

• Car Hops

Which box and whisker plot has the highest median?

• Top plot

• Bottom plot

The spread of 1st period class is greater than the spread of 2nd period class.

• TRUE

• FALSE