Referring to Exercise 2.20, construct a density histogram using the intervals (6.5, 6.7 ], (6. 7, 6.9], (6.9, 7.1 ], ( 7.1, 7.5], and (7.5, 7.9 ].

Using R: With the observations in x

hist (x,breaks = c(6.5,6. 7,6.9, 7.1, 7.5, 7 .9), prob = T)

Data from in Exercise 2.20

In a recent year, 35 sites around the world experienced earthquakes of magnitude greater than 6.5.

Construct a histogram using equal-length intervals starting with (6.5, 6.8 ], where the right-hand endpoint is included but not the left-hand endpoint.

6.6 6.6 6.6 6.6 6.7 6.7 6.7 6.8 6.9 6.9 6.9 6.9 7.2 7.2 7.0 7.0 7.1 7.1 7.1 7.7 7.8 7.8 7.8 7.9 7.9 6.6 6.6 6.7 6.7 6.8 6.8 7.0 7.0 7.5 7.6