Question

out of a class(2 sections) of 80 students, 10 I scored above 90%, 20 scored between 80% and 90% , it scored between 70% and 80%, thanks 20 scored below 70%. feel the pictograph and pie chart to show this.​

Answer 1

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For competitive xm only

Let there are total 100 students in a class each having 80 marks

100—— 80

If 10%of the students having 95 marks

It means 10 students each having 95 marks

95- 80=15 (15 marks are more than their average marks)

15 ×10=150 marks are more (of total 10 students )

20% students having each 90 marks

90–80 =10 (more than their average 80 marks)

20 ×10 =200 total marks are more for 20 students

Total marks more than their average for 30 studeare 200+150=350

That means if these 30 students having 350 more marks then to maintain overall average (80 ) 70 students having 350 less marks

So the average of 350 for 70 students is 350/70=5 so the average of remaining students are 80 -5 =75

Answer 2

QUESTION⤵

out of a class(2 sections) of 80 students, 10 I scored above 90%, 20 scored between 80% and 90% , it scored between 70% and 80%, thanks 20 scored below 70%. feel the pictograph and pie chart to show this.

ANSWER⤵

✏For competitive xm only

Let there are total 100 students in a class each having 80 marks.

100—— 80

If 10%of the students having 95 marks

It means 10 students each having 95 marks.

95- 80=15 (15 marks are more than their average marks)

15 ×10=150 marks are more (of total 10 students )

20% students having each 90 marks

90–80 =10 (more than their average 80 marks)

20 ×10 =200 total marks are more for 20 students.

Total marks more than their average for 30 studeare 200+150=350

That means if these 30 students having 350 more marks then to maintain overall average (80 ) 70 students having 350 less marks.

So the average of 350 for 70 students is 350/70=5 so the average of remaining students are 80 -5 =75

HOPE IT'S HELP YOU✌

THANKU✅