Here are the missing probabilities:
P(X = 2) = | 16 |
Six of the 16 possible outcomes have 2 heads (X = 2); namely HHTT, HTHT, HTTH, THHT, THTH, and TTHH. | |
P(X = 3) = | 16 |
Four of the 16 possible outcomes have 3 heahs (X = 3); namely HHHT, HTHH, HHTH, and THHH. | |
P(X = 4) = | 16 |
Only one of the 16 possible outcomes has 4 heads (X = 4); namely HHHH. |
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