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23 April, 22:15

Given the frequency table, what percentage of the students that like rock are also in grades 11-12? Round to the nearest whole percent.

Band Preference for School Dance

Rap Rock Country Row totals

Grades 9-10 40 30 55 125

Grades 11-12 60 25 35 120

Column totals 100 55 90 245

a. 10%

b. 21%

c. 25%

d. 45%

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Answers (2)
  1. 23 April, 22:17
    0
    Answer: d. 45%

    Step-by-step explanation:

    According to the frequency table there are 30 sudents who like rock in grades 9-10 and 25 students that like rock and are in grades 11-12.

    25 : 55 = n : 100

    25 · 100 = 55 · n

    2500 : 55 = n n = 45.454545 n = 45%

    55 is the total amount of students that like rock

    25 is the total amount of students that like rock in grades 11-12

    100 is the total percentage
  2. 23 April, 22:41
    0
    d. 45%

    Step-by-step explanation:

    In total there are 30 + 25 = 55 students in total that like rock. From these there are 25 who are in grades 11-12. This makes that (25/55) * 100% = 45.45% of the students that like rock are in grades 11-12.
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