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?

(a)  

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