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The result of tossing a fair dice 120 times is summarized above. Find the value of x

A. 20

B. 22

C. 21

D. 19

QUICK ANSWER…

A

DETAILS…

We you can safely deduct from the question is that total frequency = 120, hence:

12 + 20 + x + 21 + x – 1 + 28 = 120

80 + 2x = 120

2x = 120 – 80

2x = 40

x = 40/2 = 20

Now for the right answer to the above question:

1. Option A is correct.
2. Option B is incorrect.
3. C is incorrect.
4. D is not the correct answer.

KEY-POINTS…

You may please note these/this:

• Only the frequency is used here because that is only what we need to do our calculation.
• The number of times the dice was tossed is referred to as the frequency.
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/ culled from 2020 JAMB-UTME mathematics past question 36 /