Math 30-3 Midterm Review

After testing 312 cell phone batteries, 11 were found to be defective. What is the experimental probability of finding a defective battery, expressed as a percentage?

• 3.3%

• 3.5%

• 5.2%

• 8.8%

In 42 chances up at bat, Joe has hit 5 home runs. Based on this information, what is the probability that he will hit a home run next time he is up at bat?

• 17%

• 14%

• 19%

• 12%

A gumball machine contains 200 gumballs, 45 of which are black. What are the odds against getting a black gumball out of the machine?

• 9:40

• 9:31

• 31:9

• 40:9

The probability of a car speeding through a school zone is 0.045. What are the odds in favour of a car being a speeder?

• 9:200

• 9:191

• 1:19

• 9:19

• $91.90

• $97.40

• $94.47

• $383.91

What is the median of the following data set?

3, 6, 23, 24, 29, 29, 31, 32, 32, 35, 35

• 30

• 25

• 29

• 0

Jill is studying for her math test. She records the number of hours she studies each day. In 6 days, she studied the following number of hours:

4.7, 3.6, 15.5, 5.1, 5.1, 3.5

• 4.7, 5.1, 5.1, 5.5

• 3.5, 4.7, 5.1, 5.5

• 3.5, 3.6, 4.7, 5.1

• 3.6, 4.7, 5.1, 5.1

There are 128 competitors in a tennis tournament. If Milo places in the 85th percentile, how many people placed above him in the final rankings?

• 109

• 21

• 103

• 18

The wingspan of a female red-tailed hawk being monitored in order to collect migration data is 127 cm. What are the precision and uncertainty of this measurement?

• precision 1 cm, uncertainty ±0.5 cm

• precision 101 cm, uncertainty ±10.1 cm

• precision 1 cm, uncertainty ±0.01 cm

• precision 0.001 cm, uncertainty ±0.0005 cm

• 8 cm ± 0.5 cm

• 8 cm ± 0.5 cm

• 8.75 cm ± 0.5 cm

• 9 cm ± 0.5 cm