a normal distribution has a mean of 50 and a standard deviation of 6. What is the probability that a value selected at random from this data is in the interval from 38 to 56? express your answer as a percent rounded to the nearest tenth.
a) 79.5%
b)81.5%
C)85%
d) 90%

Question

a normal distribution has a mean of 50 and a standard deviation of 6. What is the probability that a value selected at random from this data is in the interval from 38 to 56? express your answer as a percent rounded to the nearest tenth. 
a) 79.5%
b)81.5%
C)85%
d) 90%

mrnood · Answer

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How many standard deviations is the lower bound( 38) below the mean?
How many standard deviations is th eupper bound above the mean?

Look up in tables the distribution between those SD limits