9709 P51 - Jun 2021 - Q6
3284
In Questa, 60% of the adults travel to work by car.
(b) A random sample of 150 adults from Questa is taken. Use an approximation to find the probability that the number who travel to work by car is less than 81. [5]
(c) Justify the use of your approximation in part (b). [1]
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