The table shows the time it took a group of students to complete a puzzle. Time (t) in minutes
Frequency
5 2
10 9
15 20 WOO
25 a) Work out an estimate for the mean time it took the students.
Round your answer to 2 significant figures.
b) What fraction of the students finished in less than 20 minutes?

a) The mean time it took the students, t ≈ 17.08 minutes

b) The fraction of the students that finished under 20 minutes is 2/3 of the students

Step-by-step explanation:

a) The mean of the frequency of grouped data is given as follows;

The given data arranged in tabular form is presented as follows;

Therefore, the mean time it took the students = ∑(f·m)/N = 410/24 =

The mean time it took the students, t ≈ 17.08 minutes

b) The number of the students that finished under 20 minutes = 2 + 9 + 5 = 16 students

The fraction of the students that finished under 20 minutes = 16/24 of  the = 2/3 of the students.

step-by-step explanation:

is there any photos or whatever?