Question

a survey was conducted with high school students in each grade to see how many prefer math or science. some of the data are shown below. which statement is true about the joint frequencies in this table? twenty - three 9th graders and fifteen 11th graders prefer math. fourteen 11th graders prefer math and eight 10th graders prefer science. thirty - five 12th graders prefer math and nine 10th graders prefer science. twenty - three 9th graders and thirty - two 12th graders prefer math. 9 10 11 12 total math 18 90 science 40 15 32 95 total 63 26 29 67 185

Explanation:

Step1: Analizar la tabla

Observamos los valores en la tabla de frecuencias.

Step2: Identificar valores de preferencia por rango

Para los 9º grado en la fila de Matemáticas, restando 40 (preferencia por Ciencias) de 63 (total 9º grado) obtenemos 23 que prefieren Matemáticas. Para los 11º grado en la fila de Matemáticas, vemos directamente que son 15.

Answer:

A. Twenty - three 9th graders and fifteen 11th graders prefer math.