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Andy spins a fair spinner numbered 1 - 5 and rolls a fair dice. What is the probability of spinning a multiple of 4 and rolling a factor of 15?

 May 20, 2020
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"Andy spins a fair spinner numbered 1 - 5 and rolls a fair dice. What is the probability of spinning a multiple of 4 and rolling a factor of 15?"

 

Prob spin multiple of 4:  p1 = 1/5  since there is only one possibility, namely 4 itself.

 

Prob roll a factor pf 15:  p2 = 1/2  since the factors are 1, 3 and 5, half of the numbers on the die.

 

These are independent events, so probability of both together: p = p1*p2 = (1/5)*(1/2) = 1/10

 
 May 20, 2020

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