In Toronto, Canada residents can pick up and drop off a water sample kit at one of six Toronto Public Health locations to sample tap water for lead. Download “leadsampling_2016”. The file has the sampling results per partial ZIP Code.

a) Note that the eighth observation of lead amount (parts per billion) is <0.05 and in fact, this occurs several times. Replace17 all <0.05 in the data set with 0.05.
b) Use a computer to get the minimum and maximum.
c) With a computer get the mean, median, standard deviation, and IQR of lead amount.
d) What impact does replacing <0.05 by 0.05 have on obtaining the statistics in 4.36c?
e) Build a boxplot for lead amount (parts per billion) for the partial postal codes M6G. Interpret.
f) Build a boxplot for lead amount (parts per billion) for the partial postal codes M4L. Interpret.