Marks of 50 students in a claus
are
X1, X2, X3............X50
If the mean of 50 students is X,
Find the change in mean if marks of each student is increased by 5
Find the change in mean if marks of each student is halved
Average marks of the class is 80. a new students joins the class as a result the
average marks decreases to 79. Find the marks scored by the new student
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