the following is a random sample of 90-day futures prices in dollars for 1 oz of silver from the wall street journal issues in may and june of 1997. 4.74, 4.77, 4.87, 4.91, 4.83, 4.72, 4.92, 4.86, 4.97, 4.71, 4.90, 4.93, 4.75, 4.88, 4.79, 4.83, 4.89.

a--construct a stem-and-leaf plot of the data

b--construct a new stem-and-leaf plot of the data by doubling the stem

c--construct a histogram of the data

d--desribe the shape of the histogram