The test scores of 40 students are summarized in the frequency distribution below. Find the mean. One decimal place. 15.5 70.3 14.1 13.3

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.

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step-by-step explanation:

ratio is 2 : 9

the answer is three

13.5 : 3