1.

1). 72.95%2). 64.75%3). 53.65%4). 66.36%

Answer»

⇒ Average = sum of elements / number of elements

Given,

There are 100, 200, 300 and 220 students were attends the FOUR exams named A, B, C and D respectively and PASSING PERCENTAGE for this four exams is 45%, 65%, 60% and 80% respectively.

Number of passed students in A exam =

= (45/100) × 100

= 45

Number of passed students in B exam =

= (65/100) × 200

= 130

Number of passed students in C exam =

= (60/100) × 300

= 180

Number of passed students in D exam =

= (80/100) × 220

= 176

Number of passed students including four exams =

= 45 + 130 + 180 + 176

= 531

Passing percentage =

= {531/(100 + 200 + 300 + 220)} × 100

= (531/820) × 100

= 64.75%

The passing percentage of an institute including this four exams is 64.75%.



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