13. imagine that you are taking a class and your chances of being asked a question in class are 1% during the first week of class and double each week thereafter (i. e., you would have a 2% chance in week 2, a 4% chance in week 3, an 8% chance in week 4). what is the probability that you will be asked a question in class during week 7?

 There is probability that he will be asked a question in class during Week 7 is 64%.

Step-by-step explanation:

Since we have given that  

Probability that question in class being asked during Week 1 = 1%  

Probability that question in class being asked during Week 2 = 2%  

Probability that question in class being asked during Week 3 = 4%

and so on.

So, we need to find the probability that question being asked in class during week 7.

Since it forms geometric series:

1%, 2%, 4%, ........

So, we need to find the 7 th term:  

Hence, there is probability that he will be asked a question in class during Week 7 is 64%.

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.