The cumulative frequency curve shows the lengths, in cm, of 100 snakes in a zoo.   a) Estimate the value of the first, second (median) and third quartiles. b) The smallest snake measures 9 cm and the largest has a length of 650 cm. Draw a box-and-whisker plot that represents these data. c) Construct a frequency table for some lengths of snakes d) With the above data, estimate the mean and standard deviation.

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