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5.1
đż 1 2 3 4
đ(đ = đ„) 0.2 0.3 0.4 đ
5.2
5.3
5.4
đż 40-44 45-49 50-59 60-79
đ 12 17 5 2
A random sample of 30 students each recorded the number, đ„,
of videos they watched during a 3 week period. The results
are summarised as: đ„ = 407, đ„2 = 6535 Calculate the standard deviation of this data.
5.5
The random variable đ has a cumulative function
đč đ„ =3đ„â1
8 for x = 1, 2, 3
Find the probability distribution of đ
5.6
5.7
5.7a