Question

Question 3: Many scientists have warned that global warming is causing the polar ice caps to melt and, therefore, sea levels around the world to rise. A random sample of the sea level (in millimeters) at Rockport, Massachusetts, from 1987 to 2011 was obtained and is summarized in the following table Class Frequency Relative frequency width density 1400-1500 1500-1600 1600-1800 1800-2000 2000-2100 2100-2200 2200-2300 2300-2800 total 41 192 79 60 15 10 400 a. Complete the frequency and relative frequency distributions, class width and densities. b. Draw a histogram with unequal intervals corresponding to the relative frequency dis- tribution

Answer 1

a)

Class		Frequency (F)	Relative Frequency=F/400	Width	Density
1400	1500	1	0.0025	100	0.0025
1500	1600	2	0.005	100	0.0075
1600	1800	41	0.1025	200	0.11
1800	2000	192	0.48	200	0.59
2000	2100	79	0.1975	100	0.7875
2100	2200	60	0.15	100	0.9375
2200	2300	15	0.0375	100	0.975
2300	2800	10	0.025	500	1
Total		400

b)