Question 367004: I am using the TI 83Plus calculator, I am not sure of what tables I should use to solve this problem. Your help is appreciated.
The daily sales at a convience store produce a normal distribution with a mean of $1,250 and a standard deviation of $125.
What is the probability that the sales at this store on any given day are less than $1,310?our instructor insist we use a calculator to solve.
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! Here are the steps to compute the probability
1) Hit 2nd, then hit the 'vars' key. This will bring up the distribution menu
2) Now find the "normalcdf" and select that option
3) On the home screen, the text "normalcdf(" will be there (without quotes). Now enter -9999, 1310, 1250, 125 followed by a closing parenthesis ")"
So you should have: normalcdf(-9999, 1310, 1250, 125)
Note: the first two numbers are the boundaries. The left boundary should be negative infinity, but there is no "infinity" key (on this calculator). However, -9999 is a small enough number for this problem. The right boundary is 1310, which is the second number. The next two numbers are the mean and standard deviation.
When you plug all of this info in, the answer you should get is approximately 0.68436
So the probability that the sales are less than $1,310 is approximately 0.68436 (about a 68.436% chance)
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