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.

Number of hours Total number of students
0 1
1 3
2 2
3 5
4 9
5 7
6 3

Determine the probability that a student studied for 4 hours.
0.3
0.7
0.9
3.0

Answer 1

`\Huge \boxed{\boxed{\bf{0.3}}}`

Explanation:

To determine the probability that a student studied for 4 hours, we need to calculate the ratio of the number of students who studied for 4 hours to the total number of students surveyed.

From the given data, we can see that 9 students studied for 4 hours.

The total number of students surveyed is the sum of the frequencies for each category, which is:

• 
  `\tt{1 + 3 + 2 + 5 + 9 + 7 + 3 = 30}`

Therefore, the probability that a student studied for 4 hours is:

• 
  `\tt{(9)/(30) = 0.3}`

So, the correct answer is 0.3.

#BTH1

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