Here are two groups of numbers, A and B. Group A Group B
23 17
15 12
25 24
18 11
29 6
One number is moved from A to B.
The sum of the numbers in B is now 20 less than the sum of the numbers in A.
a) Which number is moved?
(1)
b) After the number is moved, what
is the sum of the numbers in B?
(1)
.
c) If a pen and a pencil cost £1.10 for both and the pen
costs £1 more than the pencil, what is the cost of the pen? £
(1)
Total marks: 3

People end up tossing 12% of what they buy at the grocery store. assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a. calculate the mean and the standard error for the sample proportion p. b. describe the sampling distribution of p in part a. draw a graph of this probability distribution with its mean and standard deviation. what is the probability that your survey will provide a sample proportion more than 15%? c. d. population proportion? what is the probability that your survey will provide a sample proportion within + 0.03 of the