Chapter 8.5, Problem 1E

Let f(x) be the probability density function for the lifetime of a manufacturer’s highest quality car tire, where x is measured in miles. Explain the meaning of each integral.

(a) ${\displaystyle {\int }_{30,000}^{40,000}f(x)dx}$

(b) ${\displaystyle {\int }_{25,000}^{\infty }f(x)dx}$