How much will be he cost?

15.
Mean, µ = 20
Standard deviation, = 2
The formula for raw scores is,
X = µ + z
Where ‘z’ is the z-score.
Calculations:
When z = -3
X = 20 -3*2
X = 14
When z = -2
X = 20 -2*2
X = 16
When z = -1
X = 20 -1*2
X = 18
When z = 0
X = 20 + 0*2
X = 20
When z = 1
X = 20 + 1*2
X = 22
When z = 2
X = 20 + 2*2
X = 24
When z = 3
X = 20 + 3*2
X = 26
16.
Mean, µ = 60
Standard deviation, = 25
The formula for raw scores is,
X = µ + z
Where ‘z’ is the z-score.
Calculations:
When z = -3
X = 60 - 3*25
X = -15
When z = -2
X = 60 -2*25
X = 10
When z = -1
X = 60 -1*25
X = 35
When z = 0
X = 60 + 0*25
X = 60
When z = 1
X = 60 + 1*25
X = 85
When z = 2
X = 60 + 2*25
X = 110
When z = 3
X = 60 + 3*25
X = 135
Answers corresponding to the question 16 are as follows:
a. The raw score corresponding with a z of -3 is -15.
b. Almost all the scores fall between raw scores -15 and 135.
c. Percent of scores fall between scores 35 and 85 is 68.27%.
d. Probability that a score lies between 35 and 85 is 0.6827.
e. Probability that a score is higher than 60 is 0.5.
f. About 95% of scores fall between scores 11 and 109.
g. The probability is 0.95 that a score falls between 11 and 109.
h. The score corresponding with a percentile rank of 50 is 60.
Fill in the blanks:
14. When an event cannot occur, its probability is 0.
15. When an event must occur, its probability is 1.
16. The middlemost 50% of scores in a normal...