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grigory [225]
3 years ago
5

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

ercent.
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%
Mathematics
2 answers:
Ostrovityanka [42]3 years ago
7 0

Answer:

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.

Romashka-Z-Leto [24]3 years ago
4 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       <u>  n = 45%</u>

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

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