Question

Use the mean formula to write an equation to estimate x , the number of students who attended the fourth meeting.


c. Solve the equation in part (b) to find the number of students who attended the fourth meeting.


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Answer 1

The required formula to find the number of students who attended the fourth meeting is 80 = 56 + x

Using the mean formula, the number of students who attended the fourth meeting is 24

Formula to obtain the mean :

Mean = ΣX/ n

X = number of students that attended each meeting

n = number of meetings

X = meeting 1 + meeting 2 + meeting 3 + meeting 4

n = 4

Mean = 20

Let number of students who attended 4th meeting = x

Mean = ΣX/ n

20 = (18 + 21 + 17 + x) / 4

80 = 56 + x

x = 80 - 56

x = 24

Hence, 24 students attended the fourth meeting.

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