Consider the following frequency distribution:

Interval	Frequency
10 < x 20	12
20 < x 30	15
30 < x 40	25
40 < x 50	4

a-1. Construct the relative frequency distribution. (Round your answers to 3 decimal places.)

a-2. What proportion of the observations are in the interval 20 < x 30? (Round your answer to 3 decimal places.)

b-1. Construct the cumulative frequency distribution and the cumulative relative frequency distribution. (Round "Cumulative Relative Frequency" to 3 decimal places.)

b-2. How many of the observations are less than 40?

c. What proportion of the observations are less than 30? (Round your answer to 3 decimal place.)

Consider the following frequency distribution:

Interval	Frequency
10 < x 20	12
20 < x 30	15
30 < x 40	25
40 < x 50	4

a-1. Construct the relative frequency distribution. (Round your answers to 3 decimal places.)

interval. relative frequency

10 < x<= 20

20

30

40

a-2. What proportion of the observations are in the interval 20 < x 30? (Round your answer to 3 decimal places.)

promotion of the obersations:

b-1. Construct the cumulative frequency distribution and the cumulative relative frequency distribution. (Round "Cumulative Relative Frequency" to 3 decimal places.)

interval cumulative frequency. cumulative relative frequency 10 < x<= 20

20

30

40

b-2. How many of the observations are less than 40? number of observations:

c. What proportion of the observations are less than 30? (Round your answer to 3 decimal place.)

proportions of observations: