The following table shows the marks (in percentages) obtained by six students in five different subjects in an examination. The maximum marks in each subject are 100.

Student 

SUBJECT 

 

CS 

PHYSICS 

CHEMISTRY

MATHS 

HISTORY 

GEOGRAPHY

A

95 

65 

90 

70 

70 

80

B

90 

70 

75

75 

85 

85 

C

80 

80 

65 

70 

90 

95 

D

85 

90 

85 

75 

90 

95 

E

80 

95 

95 

85 

90 

95 

F

90 

90 

90 

95 

90 

90 

Answer the following question based on the table:

What are the average marks obtained by all the six students in CS? (up to two decimal places)

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  1. 84.76
  2. 83.33
  3. 86.67
  4. 81.67

Answer (Detailed Solution Below)

Option 3 : 86.67
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Formula Used:

Average = Sum of observations / Number of observations

Calculation:

Sum of marks in CS = 95 + 90 + 80 + 85 + 80 + 90

⇒ Sum of marks in CS = 520

Average marks in CS = 520 / 6

⇒ Average marks in CS = 86.666...

Average marks in CS (up to two decimal places) = 86.67

The average marks obtained by all the six students in CS is 86.67.

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