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A student keeps a mood diary for a social psychology experiment.Over a 30-day period, he records that he is happy on 13 days, grumpy of

A student keeps a mood diary for a social psychology experiment.Over a 30-day period, he records that he is happy on 13 days, grumpy of 5 days, sad on 2 days, and anxious on 10 days.Compute the probability that tomorrow he will be: (2 marks)

a) happy

b) grumpy

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