When buying a candy bar, there is a 20% chance that it will also include a coupon for a second candy bar. A student
2 answers:
<h2>Answer:</h2>
- To estimate the probability that more than 2 out of 7 candy bars will include a coupon, the student must count the number of trials with more than two 1's. and divide by the number of trials.
- This gives an estimated probability of about 0.1875.
1 represent a candy bar with a coupon and numbers 2 through 5 represent a candy bar without a coupon.
Now we are asked to find the probability that, if she buys 7 candy bars, more than 2 will include a coupon.
Total number of outcomes=16
Number of favorable outcomes(i.e. the outcome which have more than 2 one) = 3
( Since the outcomes are: 2113415 4341112 1455141 )
Hence, the probability is the ratio of Number of favorable outcomes to the total number of outcomes.
i.e.
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Explanation:
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in equation (1) we get the equation of step 8, i.e.,
Hence, the missing reason in Step 8 is substitution of .