Question

When buying a candy bar, there is a 20% chance that it will also include a coupon for a second candy bar. A student

wants to determine the probability that, if she buys 7 candy bars, more than 2 will include a coupon.


To do this, she uses a random number table to pick 7 numbers from 1 to 5. She lets 1 represent a candy bar with a
coupon and numbers 2 through 5 represent a candy bar without a coupon.. She repeats this for a total of 16 trials. Theresults are shown in the table.
5144543 2114445 2113415 4341112
3423143 3435251 1324353 3223233
2155545 4222542 4443352 5222235
1455141 4554414 5154443 3153242

Select from the drop-down menus to correctly complete each statement

To estimate the probability that more than 2 out of 7 candy bars will include a coupon, the student must count the numberof trials with Choose ________ and divide by the number of trials.

This gives an estimated probability of about Choose _________.


​

Answer 1

• 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.

Explanation:

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.
`Probability=(3)/(16)\\\\\\Probability=0.1875`

Answer 2

Explanation: