Question

The average height in the class is 66 inches with a standard deviation of 3. A z score of -1.6 corresponds with how many inches?

1)58.32

2) 60.92

3) 70.8

4) 57.1

if we are rolling a six-sided die what is the probability of rolling a 2 or 3 on the first roll and a 2,3 or 4 on the second roll?

1) 5/6 or 0.14

2) 6/36 or 0.17

3) 6/12 or 0.50

4) 3/36 or 0.08

Answer 1

Answer 1

The formula for Z score is given by:

Answer 2

The sample space on rolling two dice are:

	1	2	3	4	5	6
1	(1, 1)	(1, 2)	(1, 3)	(1, 4)	(1, 5)	(1, 6)
2	(2, 1)	(2, 2)	(2, 3)	(2, 4)	(2, 5)	(2, 6)
3	(3, 1)	(3, 2)	(3, 3)	(3, 4)	(3, 5)	(3, 6)
4	(4, 1)	(4, 2)	(4, 3)	(4, 4)	(4, 5)	(4, 6)
5	(5, 1)	(5, 2)	(5, 3)	(5, 4)	(5, 5)	(5, 6)
6	(6, 1)	(6, 2)	(6, 3)	(6, 4)	(6, 5)	(6, 6)

We need to find P(2,3 on the first roll and 2,3 or 4 on the second roll)

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