Serial numbers for a product are to be made using 4 letters followed by 2 digits the letters are to be taken from the 1st 9 letters of the alphabet with no repeats the digits are taken from the 10 digits (0,1,) with no repeats how many serial numbers can be generated

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Now max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

What ratio is proportional to 18/21