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Question

Khilona earned scores of 97,73 and 88 respectively in her first three examinations. If she scored 80 in the fourth examination, then her average score will be


A

Increased by 1

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B

Increased by 1.5

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C

Decreased by 1

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D

Decreased by 1.5

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Solution

The correct option is D

Decreased by 1.5


Step 1: Find the average marks before fourth examination

Average=SumofMarksObtainedinallExaminationsNumberofExaminations

Average marks before fourth examination = Average in first three examinations

Average marks before fourth examination = 97+73+883=2583

Average marks before fourth examination = 86 marks

Step 2: Find the average marks after fourth examination

Average marks after fourth examination =97+73+88+804=3384

Average marks after fourth examination= 84.5 marks

Step 3: Find the difference between average marks before and after fourth examination

Difference in average marks before and after fourth examination=86-84.5=1.5

Thus, if Khilona scored 80 in the fourth examination, then her average score will be decreased by 1.5

Therefore, option D is the correct answer.


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