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I believe the problem ask for s which is the standard
deviation. We must recall that the formula for z statistic is stated as:
z = (x – x over bar) / s
Where,
z = z statistic = 2.5
x = sample value or sample score = 102
x over bar = the sample mean or sample average = 100
s = standard deviation = unknown
Rewriting the equation in terms of s:
s = (x – x over bar) / z
Substituting the given values into the equation:
s = (102 – 100) / 2.5
s = 0.8
Therefore the standard deviation s is 0.8
Answer:
Child bye
Step-by-step explanation:
A student who studies 10 hours per week should earn a score of 95
Answer:
It will take 9 weeks
Step-by-step explanation:
56 + 8x 
123
8x 67
x 8.375
