Geometry, Statistics and Probability

You have 8 pairs of socks in the dryer. Only one pair is black. You randomly choose two of the socks. What is the probability that you got both of the black socks? (Remember a pair of socks = 2 socks.)

•  $\frac{1}{120}$  

•  $\frac{1}{56}$  

•  $\frac{1}{8}$  

•  $\frac{1}{15}$  

Brianna flips a coin then rolls a number cube. These events are

• independent

• dependent

• both independent and dependent

• none of the above

The difference between the largest and the smallest data values is the

• variance

• interquartile range

• range

• standard deviation

The standard deviation of a sample of 100 observations equals 64. The variance of the sample equals

• 8

• 10

• 6,400

• 4,096

If the perimeter of a square is 72 inches, what is its area?

• $18\ in^2$

• $72\ in^2$

• $324\ in^2$

• $5,184\ in^2$

Ken is adding a ribbon border to the edge of his kite. Two sides of the kite measure 9.5 inches, while the other two sides measure 17.8 inches. How much ribbon does Ken need?

• $27.3\ in$

• $36.8\ in$

• $54.6\ in$

• $45.1\ in$

A soup can has a radius of 4.3 cm and a height of 11.6 cm. What is the volume of the soup can to the nearest tenth of a cubic centimetre? (Use  $\pi=3.14$  )

•  $49.9\ cm^3$  

•  $168.4\ cm^3$  

•  $673.5\ cm^3$  

•  $1,816.8\ cm^3$  

Given the numbers $12,\ 15,\ 18,\ 9,\ 10,\ 12,\ 17,\ 12,\ 15,\ 8$  
What is the mean?

• 12

• 128

• 12.8

• 10

Given the numbers $12,\ 15,\ 18,\ 9,\ 10,\ 12,\ 17,\ 12,\ 15,\ 8$  
What is the median?

• 12

• 128

• 12.8

• 10

What is the probability of tossing a penny 2 times and getting heads each time?

• $\frac{1}{4}$

• $1$

• $\frac{1}{2}$

• $\frac{3}{4}$