A bag contains blue, red, yellow and green balls only. A ball is taken from the bag at random. The table shows some information about the probabilities. Abdul takes a ball at random and replaces it in the bag. He does this 200 times. Find how many times he expects to take a red ball.

Mathematics
IGCSE&ALevel
CAIE
Exam No:0580_s20_qp_21 Year:2020 Question No:4(b)

Answer:

40

Knowledge points:

E8.4.1 Understand relative frequency as an estimate of probability.
E8.4.2 Expected frequency of occurrences.

Solution:

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