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.