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question #42
42. The mean marks obtained by a class of 40 students is 65. The mean marks of half of the students is found to be 45. The mean marks of the remaining students is

A
mean marks of 40 students = 65
total marks = 40 * 65 = 2600

mean marks of half of students = 45
so total marks of half(20) = 20* 45 =900

remaining marks of 20 students
= 2600-900 = 1700

mean marks of remaining 20 students
= 1700/20=85 marks. 

.
mean marks of 40 students = 65
total marks = 40 * 65 = 2600

mean marks of half of students = 45
so total marks of half(20) = 20* 45 =900

remaining marks of 20 students
= 2600-900 = 1700

mean marks of remaining 20 students
= 1700/20=85 marks. 

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NET DECEMBER 2013 PAPER1