68 / 80 Marks U
3 4
37%
Spinner A Spinner B
In a game, two fair spinners are spun.
If the arrows land on different numbers, 1 2
2 3
the score is the higher number.
If the arrows land on the same numbers,
4
7
Ž 15
the score is 0
a) Complete the table to show the possible scores (2)
2
b) What is the probability that the score is an odd number? (1)
1 2
Spinner B
2 3 5
2
0
c) The game is played using spinners C and D.
The table shows some possible scores.
Spinner Spinner D
Spinner D
Spinner A
4
7
1
4
6
Spinner
7
0
13
4
| 6
7
What are the missing numbers
on spinner D?
(2)
09
Total marks: 5

An engineer is going to redesign an ejection seat for an airplane. the seat was designed for pilots weighing between 120 lb and 161 lb. the new population of pilots has normally distributed weights with a mean of 125 lb and a standard deviation of 28.1 lb. a)if a pilot is randomly selected, find the probability that his weight is between 120 lb and 161 lb. the probability is approximately? b. if 36 different pilots are randomly selected, find the probability that their mean weight is between 120 lb and 161 lb. the probability is approximately? c. when redesigning the ejection seat, which probability is more relevant? . part (b) because the seat performance for a single pilot is more important. b. part (b) because the seat performance for a sample of pilots is more important. c. part (a) because the seat performance for a sample of pilots is more important. d. part (a) because the seat performance for a single pilot is more important.