Toss 4 times Suppose you toss a fair coin 4 times. Let X = the number of heads you get

Chapter 6, Problem 1

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QUESTION:

Suppose you toss a fair coin 4 times. Let X = the number of heads you get.

(a) Find the probability distribution of X.
(b) Make a histogram of the probability distribution. Describe what you see.
(c) Find \(P(X \leq 3)\)) and interpret the result.

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QUESTION:

Suppose you toss a fair coin 4 times. Let X = the number of heads you get.

(a) Find the probability distribution of X.
(b) Make a histogram of the probability distribution. Describe what you see.
(c) Find \(P(X \leq 3)\)) and interpret the result.

ANSWER:

Step 1 of 3

(a)

There are 16 outcomes when a coin is tossed four times. The outcomes which result in values of X being 0, 1, 2, 3, and 4 are given as:

X = 0; (TTTT)

X = 1; (HTTT)(THTT)(TTHT)(TTTH)

X = 2; (HHTT)(HTHT)(HTTH)(TTHH)

X = 3; (HHHT)(HTHH)(HHTH)(THHH)

X = 4; (HHHH)

We can summarize the probability distribution of X as follows:

\(\begin{array}{|c|c|c|c|c|c|} \hline \text { Value } & 0 & 1 & 2 & 3 & 4 \\ \hline \text { Probability } & 1 / 16 & 4 / 16 & 6 / 16 & 4 / 16 & 1 / 16 \\ \hline \end{a

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