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IRINA_888 [86]
3 years ago
12

A coin is tossed seven times and the sequence of heads and tails is observed. what is the number of different outcomes having ex

actly three​ heads?
Mathematics
1 answer:
Margaret [11]3 years ago
7 0
You could make a tree diagram
                  H                          T                               ← 1st toss

           H           T               H          T                       ← 2nd toss

     H       T    H      T       H     T    H    T                   ← 3rd toss
etc ,,, then count the combination of favorable outcomes

Using a calculator:
Total number of outcomes is 2^{7} = 128
Probability of getting exactly 3 heads is found using the follow calculator feature: binompdf(7, 0.5, 3) 

ANSWER: Typed into the calculator as follows binompdf(7,0.5,3)×128 = 35



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