percentage and standard deviation

Test: FINAL Question 1 This Test: 200 pts possible Submit Test EXAM In 2017 a pollution index was calculated for a sample of cities in the eastern states using data on air and water pollution. Assume the distribution of pollution indices is unimodal and symmetric. The mean of the distribution was 42.7 points with a standard deviation of 11 4 points Complete parts (a) through (c) below. a. What percentage of eastern cities would you expect to have a pollution index between 19.9 and 65 5 points? % (Type a whole number.) b. What percentage of eastern cities would you expect to have a pollution index between 31.3 and 54.1 points? 1% (Type a whole number)