Posted by **Willow** on Wednesday, March 20, 2013 at 5:02pm.

There are 12 girls and 9 boys in Mrs. Johnson's classroom. She said that if she randomly selects one student from her classroom the probability that it is a boy is 3/4. Which mistake did Mrs. Johnson make?

A. She divided the number of girls by the total number of students.

B. She divided the number of boys by the total number of students.

C. She divided the number of girls by the number of boys.

D. She divided the number of boys by the number of girls.

## Answer this Question

## Related Questions

- Math - There are 12 girls and 9 boys in Mrs. Johnson's classroom. She said that ...
- math - The ratio of boys to girls in a class room was 9:8. Half of the girls ...
- math - The ratio of boys to girls in a class room was 9:8. Half of the girls ...
- 8th grade math - Mr. Rosart selects two students from his class to present their...
- math - Mr. Rosart selects two students from his class to present their book ...
- math - 20 students are in a classroom. if students leave randomly, the ...
- math - In a classroom, the students are 12 boys and 6 girls. If one of the ...
- English - What is in the classroom? 1. There is a blackboard in the classroom. 2...
- Math - Ms.York has 32 boys and 18 girls in her science class. She ramdomly ...
- Math - In Mrs. Julie's classroom the ratio of boys to girls is 12 to 8. If the ...