Zinc is a trace element and it is important in wound healing, building up the immune system and DNA synthesis. The data in Table 1 represents the zinc intake (in milligrams) for a sample of 40 arthritis patients.

Table : Zinc intake (in milligrams) for arthritis patients

a) Construct a frequency distribution for the given data.

b) Calculate mean, mode and median.

c) Calculate the standard deviation of the distribution.

d) Obtain the Pearson's coefficient of skewness and comment on the shape of the distribution.

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