Edexcel IGCSE Math B 10.K expected frequency

Practise expected-frequency questions by multiplying the event probability by the number of trials or opportunities in the context.

Exam points

Calculate expected frequency from probability multiplied by number of trials.
Use probability tables for dice, lateness or repeated outcomes before estimating counts.

[Maximum number: 2]

Table 1 gives information about the probability that a biased red six-sided dice will land on each of the numbers 1,2,5,7,9,11.

Tai rolls the red dice 80 times.
Calculate the expected number of times the red dice lands on a number less than 5.

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