Question 4 (5 marks) The probability distribution table shows the probabilities of having 0, 1, 2 or 3 girls in a family
with 3 children.
1 2 3
3a3aa
P(X - x)
a Find the value for a.
[2]
121
b Find the expected value for the number of girls in a family with 3 children.
In a sample of 400 children, find the expected number of families that have 2 girls.

Adrawer contains 12 identical white socks, 18 identical black socks and 14 identical brown socks. what is the least number of socks you must choose, without looking, to be certain that you have chosen two socks of the same colour?

Adeli owner keeps track of the to-go orders each day. the results from last saturday are shown in the given two-way frequency table. saturday's to-go deli orders in person by phone online total pick up 38 25 31 94 delivery 35 28 34 97 total 73 53 65 191 what percent of the to-go orders were delivery orders placed by phone? a. 14.66% b. 38.41% c. 28.87% d. 52.83%

Which is the graph of the linear equation x – 2y = 6?