200 people are asked how many siblings they have

Question

200 people are asked how many siblings they have

Answer 1

of 200 people asked how many children they have

some say zero, others say one, others say two, others say 3

(0x + 1y + 2z +3w)/(x+y+z+w) = 2.1 = average = the expected number of children

"expected number" is impossible and not really "expected.

expected number is the mode not the mean. mode is 0, 1, 2 or 3, whichever has the highest frequency = x if x is greater than y, z or w