Consider the following cumulative frequency distribution: Interval Cumulative Frequency 15 < x ≤ 25 30 25 < x ≤ 35 50 35 < x ≤ 45 120 45 < x ≤ 55 130
a-1. Construct the frequency distribution and the cumulative relative frequency distribution. (Round "Cumulative Relative Frequency" to 3 decimal places.)
a-2. How many observations are more than 35 but no more than 45?
b. What proportion of the observations are 45 or less? (Round your answer to 3 decimal places.)
