Question

Michael made a spinner to use in a game. He tested the spinner by spinning it 4 times. The pointer landed on 1 each time. What do these results suggest about the spinner?

A. It is probably a fair spinner. The probability of spinning a “1” is 0.25.
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B. It is probably a fair spinner. The probability of spinning a “1” 4 times is 0.25 × 4, which equals 1.
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C. It is probably not a fair spinner. The probability of spinning a “1” on all 4 spins is about 0.004.
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D. It is probably not a fair spinner. The probability of spinning a “1” on all 4 spins is less than 0.0001.

Please help

Answer 1

C

Explanation:

If The probability of spinning a “1” is 0.25, then the probability of spinning 4 ones is:

0.25*0.25*0.25*0.25 = 0.25^4 ≈ 0.004

(the four events are independent)

The pointer landed on 1 each time, which probability is very low. So, we can conclude that the spinner is not fair.