2.5 The National Center for Health Statistics reports the following age breakdown of deaths in the United States during 2006. Source: The New York Times Almanac 2009, p. 392.

Age (Years) Number of Deaths (Thousands)

under 15 39.80 15–under 25 34.23 25–under 35 41.93 35–under 45 84.79 45–under 55 183.53 55–under 65 275.30 65–under 75 398.36 75 or over 1389.83 Identify the following for the 45–under 55 class:

(a) frequency,

(b) upper and lower limits,

(c) width, and

(d) midpoint.