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Mathematics
Nolan Johnson
6 September, 01:56
If z=2.5, x=102 and x=100, what is s?
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Jaylon Williams
6 September, 04:22
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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
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