Question

a group of students was surveyed in a middle - school class. they were asked how many hours they work on math homework each week. the results from the survey were recorded. determine the probability that a student studied for 5 hours. 0.16 0.23 0.70 23.0 number of hours 0 1 2 3 4 5 6 total number of students 1 3 2 5 9 7 3

Explanation:

Step1: Calculate total number of students

Add up the number of students in each category: $1 + 3+2 + 5+9+7+3=30$.

Step2: Determine number of students who studied for 5 hours

From the table, the number of students who studied for 5 hours is 7.

Step3: Calculate the probability

The probability $P$ that a student studied for 5 hours is the number of students who studied for 5 hours divided by the total number of students. So $P=\frac{7}{30}\approx0.23$.

Answer:

0.23