Question 1118905
i think the answer will be as follows:


if it takes between 11 and 21 minutes, then the possible number of minutes that it could take would be 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21.


that's a total of 11 separate and discrete minutes in that interval.


if it takes between 13 and 19 minutes, then the possible minutes that it could take would be 13, 14, 15, 16, 17, 18, 19.


that's a total of 7 separate and discrete minutes in that interval.


the probability of it taking between 13 and 19 minutes is therefore 7/11 = .6363 rounding to 4 decimal places which is equal to 63.63% rounding to 2 decimal places.