Mathematics (AS & A Level) · May / June 2022 · Paper 51 · Question 4
9709
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The question as text
Jacob has four coins. One of the coins is biased such that when it is thrown the probability of obtaining a head is 7 10. The other three coins are fair. Jacob throws all four coins once. The number of heads that he obtains is denoted by the random variable X. The probability distribution table for X is as follows. x 0 1 2 3 4 PX = x 3 80 a b c 7 80
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4(a)[4]
4(b)[1]
4(c)[3]
4(d)[2]
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