factorise x^2+?x+?

5.1 1 2 3 4 ( = ) 0.2 0.3 0.4

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5.1

𝑿 1 2 3 4

𝑃(𝑋 = 𝑥) 0.2 0.3 0.4 𝑘

5.2

5.3

5.4

𝑿 40-44 45-49 50-59 60-79

𝑓 12 17 5 2

A random sample of 30 students each recorded the number, 𝑥,

of videos they watched during a 3 week period. The results

are summarised as: 𝑥 = 407, 𝑥2 = 6535 Calculate the standard deviation of this data.

5.5

The random variable 𝑋 has a cumulative function

𝐹 𝑥 =3𝑥−1

8 for x = 1, 2, 3

Find the probability distribution of 𝑋

5.6

5.7

5.7a

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