Question

Please help it’s easy I think

Answer 1

The frequency of revision times is given by the product of the frequency

density value and the class width.

Correct response:

• The number of students are 72 students

Methods of calculation using a histogram

The estimate of the number of students who revised for less than 45

minutes is given by the area, A, under the histogram to the left of the 45

minute mark as follows;

Frequency, f = Frequency density × Class width

Number of students = ∑f

Therefore;

A = 5 × 2 + 10 × 2.2 + 20 × 1.6 + 10 × 0.8 = 72

• The number of students that revised for less than 45 minutes = 72 students

Learn more about histograms here:

brainly.com/question/17139138