Posted by Kayla on Sunday, February 10, 2013 at 4:28pm.
Mean = np
Standard deviation = √npq
Note: q = 1 - p
n = 100
p = 0.5
q = 0.5
Once you find the mean and standard deviation, use z-scores:
z = (x - mean)/sd
(x = 55)
Check a z-table to find the probability using the z-score you calculated.
54.5-50/50 = 4.5/5 = 0.9 z= 0.1841
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