The given question is incomplete. The complete question is:
The test scores of 40 students are summarized in the frequency distribution below a summarized in the given frequency distribution. score Find the mean Score Students 50-59 (5) 60-69(15) 70-79(6) 80-89(5) 90-99(9)
A) 70.3 B) 74.0 ) 74.5 D) 66.6
The correct option is B.
Step-by-step explanation:
Given,
Data Frequency
50-59 5
60-69 15
70-79 6
80-89 5
90-99 9
To find the mean of given data.
Formula
Mean = Sum of ( Freq× Mid point)÷ total frequency
Data Frequency Mid internal Freq× Mid point
50-59 5 54.5 272.5
60-69 15 64.5 967.5
70-79 6 74.5 447
80-89 5 84.5 422.5
90-99 9 94.5 850.5
Now,
Sum of ( Freq× Mid point) = 2960
Number of students = 40
So,
Mean = 2960÷40 = 74
The correct option is B.
