Question

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​

Answer 1

Answer:

You can prepare phenyl at home. Here is an outline of the process of its preparation. Study it and describe the process: Hints: [Mixing crushed resin with boiled castor oil—cooling—mixing caustic soda solution – stirring solution frequently—pouring creosote oil—leaving it for 10 minutes—adding carbolic acid and potassium permanganate—pouring water—stirring the solution—pouring into another pot—leaving it for 24 hours]