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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 $50. Find the probability that in a randomly selected month the amount spent on personal calls is less than $750

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    The standard deviation, σ, is $50. The mean is $900.
    To spend less than $750 means that the spending is less than mean - 3σ.
    The probability of this happening, assuming the spending follows the normal distribution curve, can be found from the normal distribution tables, for example:
    http://www.math.unb.ca/~knight/utility/NormTble.htm
    where the probability for the tail end of 3σ is 0.001350, or 0.135%.

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