I had 8 tampons this morning but 2/3 of the girls in my class got their period and now I’m out of tampons
4/9 - 2/3 = 4/9 - 6/9 = -2/9
Answer: <u><em>-2/9</em></u>
In order to calculate the z-score of a normal distribution, you need to apply the formula:
z = (o - m) / s
where:
o = observed value
m = mean
s = standard deviation
In your case:
z = (259 - 239) / 25 = 0.8
The answer is, indeed, z = 0.8
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