b) what percent of the total complaints can be attributed to the most prevalent complaint?

For this case we can begin adding the number of complaints and we got:

15+10+18+2+14= 59

And as we can see the higher number of complaints are for Demeaning to women with a total of 18 complaints.

And if we want to find the percent associated to this type of complaint we can use this formula:

Explanation:

For this case we assume the following info given:

Type    Description                                Number of complaints

R          Offensive racially/ ethnically         15

M         Demeaning to men                        10

W         Demeaning to women                   18

I           Ad is incomprehensible                 2

O         Other                                               14

For this case we can begin adding the number of complaints and we got:

15+10+18+2+14= 59

And as we can see the higher number of complaints are for Demeaning to women with a total of 18 complaints.

And if we want to find the percent associated to this type of complaint we can use this formula:

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