Question

The mean weight 20 students in a room is 65 kg one student one student who weight is 88kg went into the room what is the new mean of the weight of the students in the room round to nearest kilogram.

Answer 1

The new mean is 66.09

Explanation:

Mean weight of 20 students = 65kg

One student with 88kg entered the room.

New mean = ?

$\frac{x_1+x_2+....+x_2_0}{20} = 65$

$\frac{x_1+x_2+....+x_2_0 + 88}{21} = ?$

The above equation can further be written as:

$x_1 + x_2 +....+x_2_0 = 65 X 20\\\\x_1 + x_2 +....+x_2_0 = 1300$

New mean = $\frac{1300 + 88}{21}$

                 = 66.09

Therefore, the new mean is 66.09