Statistics (12th Edition)

$P(10 \leq x \leq 25) = ∫_{10}^{25} f(x).dx$ = $∫_{10}^{25} \frac{1}{d-c}.dx$ = $∫_{10}^{25} \frac{1}{20}.dx$ = 1/20 (25-10) = 15/20 = 0.75