1.

1). 59.632). 69.663). 70.654). 71.59

Answer»

Given,

The AVERAGE marks of 45 students was 70 for a unit test:

Average marks = Total marks of students/Number of students

Total marks of all 45 students = 70 × 45 = 3150

Total marks of all 45 students = 3150

Given,

It was noticed that 20th roll number student marks which is 45 was wrongly taken as 60:

Total sum of marks of 44 students = Total sum of 45 students - 60

= 3150 - 60 = 3090

∴ Total sum of marks of 44 students is 3090.

New total sum of marks of 45 students = 3090 + 45 = 3135

New total sum of marks of 45 students = 3135

New average = 3135/45 = 69.66

∴ The CORRECTED new average marks is 69.66



Discussion

No Comment Found