LO Page view A Read aloud V Draw Highlight QUESTION 3 Gohan throws a fair tetrahedral die with faces numbered 1, 2, 3, 4. If she throws an even number then her score is the number thrown. If she throws an odd number then she throws again and her score is the sum of both numbers thrown. Let the random variable X denote Gohan's score. (i) Show that P(X= 2) = . (ii) The table below shows the probability distribution of X. 2. 3 4 P(X=x) 16 8. 16 16 16 Calculate E(X) and Var(X). -/5 118
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
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QUESTION 3
Gohan throws a fair tetrahedral die with faces numbered 1, 2, 3, 4. If she
throws an even number then her score is the number thrown. If she throws
an odd number then she throws again and her score is the sum of both
numbers thrown. Let the random variable X denote Gohan's score.
(i) Show that P(X 2)
= .
16*
(ii) The table below shows the probability distribution of X.
4
5.
1
P(X=x)
16
16
16
16
Calculate E(X) and Var(X).
118
318
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