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OpenStudy (osanseviero):
The random variable X follows a normal distribution of mean=30 and standard deviation of 10. How can I find the probability of X<23?
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ganeshie8 (ganeshie8):
find the zscore then, lookup area in ztable
OpenStudy (osanseviero):
I did not know what was the z score until now...thanks a lot :)
ganeshie8 (ganeshie8):
np :) Zscore = (observation - mean)/deviation
OpenStudy (osanseviero):
What is the use of a z score table? (how does it work?)
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ganeshie8 (ganeshie8):
its just a table
OpenStudy (anonymous):
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