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Relative frequency and the probability scale worksheet — GCSE Foundation

Fifteen questions on "relative frequency and the probability scale" — DfE statement P3. Print it, or print three versions so neighbours cannot copy by letter; the key gives the letter for each version.

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Relative frequency and the probability scale worksheet — GCSE Foundation

Maths · GCSE Foundation · P3 · Relative frequency and the probability scale · Non-calculator · 15 questions

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1.A machine produces bolts. In a sample of 250 bolts, 15 are faulty. Work out the relative frequency of a bolt being faulty, giving your answer as a fraction in its simplest form.
(a)50/3
(b)3/47
(c)1/10
(d)3/50
2.On a probability scale from 0 to 1, five descriptions are used: impossible (0), unlikely (between 0 and 0.5), evens (exactly 0.5), likely (between 0.5 and 1) and certain (1). The probability that a particular bus is late is 3/8. Which description best fits this probability?
(a)unlikely
(b)likely
(c)evens
(d)certain
3.An ordinary pack of 52 playing cards contains 13 hearts. One card is taken at random from the pack. Work out the probability that the card is not a heart. Give your answer as a percentage.
(a)39%
(b)50%
(c)25%
(d)75%
4.On the probability scale from 0 to 1, which word best describes an event with probability 0.9?
(a)unlikely
(b)likely
(c)certain
(d)evens
5.The probability that a pupil chosen at random has a nut allergy is 1/10. There are 30 pupils in a class. Work out how many of the 30 pupils would be expected to have a nut allergy.
(a)1 pupil
(b)3 pupils
(c)27 pupils
(d)10 pupils
6.A bag contains 3 red counters, 2 blue counters and 2 green counters. One counter is taken at random from the bag. Work out the probability that the counter is red.
(a)2/7
(b)3/4
(c)3/7
(d)4/7
7.On a probability scale from 0 to 1, the points impossible (0), unlikely (0.25), evens (0.5) and certain (1) are marked. An event has a probability of 0.3. Between which two neighbouring marked points does 0.3 lie?
(a)evens and certain
(b)impossible and evens
(c)impossible and unlikely
(d)unlikely and evens
8.A spinner is divided into 8 equal sections. 3 of the sections are red and the rest are not red. The spinner is spun once. Work out the probability that it does not land on red.
(a)3/8
(b)5/11
(c)5/8
(d)1/2
9.At a summer fair, the probability of winning at the hoopla stall is 6/10 and the probability of winning at the coconut shy is 2/10. Work out how many times as likely a player is to win at the hoopla stall as at the coconut shy.
(a)4 times as likely
(b)3 times as likely
(c)12 times as likely
(d)6 times as likely
10.A fair six-sided dice is rolled once. Write down the probability that the score is an even number.
(a)1/6
(b)1/2
(c)2/3
(d)1/3
11.Two games at a school fete are played independently. The probability of winning game X is 3/8. The probability of winning game Y is 0.4. Which statement correctly compares the two games?
(a)Game X — 3/8 has the larger denominator.
(b)Equal — 3/8 rounds to 0.4 to one decimal place.
(c)Game Y — 0.4 is greater than 3/8.
(d)Game X — 3 is greater than 0, the units digit of 0.4.
12.The probability that Amelia's bus is late on a school morning is 9/10. Write this probability as a percentage.
(a)90%
(b)9%
(c)10%
(d)0.9%
13.The probability that a spinner lands on blue is 2/5. Write this probability as a percentage.
(a)20%
(b)40%
(c)2%
(d)4%
14.A fair six-sided dice is rolled once. Work out the probability that the score is greater than 4.
(a)1/6
(b)2/3
(c)1/3
(d)1/2
15.A spinner is spun 50 times. It lands on green 18 times. Work out the relative frequency of landing on green.
(a)0.36
(b)0.18
(c)0.64
(d)0.036

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