Question: The density function f (x) for the lifetime of a certain battery is shown in Fig. 1. Each battery lasts between 3 and 10 hours.

The density function f (x) for the lifetime of a certain battery is shown in Fig. 1. Each battery lasts between 3 and 10 hours.

(a) Sketch the graph of the corresponding cumulative distribution function F (x).

(b) What is the meaning of the number F (7) - F (5)?

(c) Formulate the number in part (b) in terms of f (x)..2 .1 1 Figure 1 2 3 4 5 6 7 8

.2 .1 1 Figure 1 2 3 4 5 6 7 8 It 9 10

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