I need help with algebra!!

Algebra
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A normal distribution has a mean of 51 and a standard deviation of 3. What is the probability that a random selected x-value from the distribution is at most 48?
A. 0.025
B. 0.16
C. 0.84
D. 0.975
May 13th, 2015

48 is one standard deviation BELOW the mean, because 51-48 = 3.

The mean probability is 0.500,  one standard deviation below is 0.34

Therefore, 0.500 - 0.34 = 0.16  choice B.

May 13th, 2015

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May 13th, 2015
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May 13th, 2015
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