SOLUTION: The total amount being spent on personal calls in a month by employees of a company follows a normal distribution with a mean of \$900 and a standard deviation of . Find the pro

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 Click here to see ALL problems on Probability-and-statistics Question 204895: The total amount being spent on personal calls in a month by employees of a company follows a normal distribution with a mean of \$900 and a standard deviation of . Find the probability that in a randomly selected month the amount spent on personal calls is less than \$750. A) 0.8333 B) 0.0013 C) 0.1667 D) 0.9987 i just need some ideas and tools to solve this one. i am so bad a t standard deviation! please!!! thankyou more than you know!!!Answer by stanbon(57967)   (Show Source): You can put this solution on YOUR website!The standard deviation is missing from your post. Cheers, Stan H.