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Mathematics

Grade9

Easy

Question

You are expecting a call from a friend anytime between 7:00 pm and 8:00 pm. You are practicing the drums and cannot hear the phone from 6:55 pm to 7:10 pm. What is the probability that you missed your friend’s call?

$\frac{1}{3}$
$\frac{1}{4}$
$\frac{1}{5}$
$\frac{1}{6}$

hint Hint:

Probability is the numerical description of the possibility of an event to occur. It helps in predicting how likely events can happen. The expressed value should be greater than 0 and less than 1. Here, we have to find the probability of the given event.

The correct answer is: $fraction numerator 1 over denominator 6 end fraction$

In the question it is given that you are expecting a call from a friend anytime between 7:00 pm and 8:00 pm. You are practicing the drums and cannot hear the phone from 6:55 pm to 7:10 pm.
Here, we have to find the probability that you missed your friend's call.
Total expected time = 60 minutes (from 7 pm to 8 pm)
From 7 to 7.10 pm, drumming is going on so during that time, phone call can be missed.
Probability = $fraction numerator left parenthesis 10 blank m i n right parenthesis over denominator left parenthesis 60 blank m i n right parenthesis end fraction$ = $fraction numerator 1 over denominator 6 end fraction$
So, the probability that you missed your friend's call is $1 over 6$ .
Therefore, the correct option is d, i.e., $1 over 6$ .

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