Question

the scores on a test for a sample of 35 statistics students are summarized in the fol
number of students score
8 90
16 80
11 70
find the mean score. round your answer to at least one decimal place.

Explanation:

Step1: Calculate total score for each group

For score 90: $8\times90 = 720$
For score 80: $16\times80 = 1280$
For score 70: $11\times70 = 770$

Step2: Sum all total scores

Total score = $720 + 1280 + 770 = 2770$

Step3: Calculate total number of students

Total students = $8 + 16 + 11 = 35$

Step4: Calculate mean score

Mean = $\frac{2770}{35} \approx 79.1$

Answer:

79.1