Most Important Selected Qs for JEE AdvancedMathematicsProbability
Paragraph: Continuous probability distributions, a continuous distribution is one in which the variate may take any value between certain limits a and b , a b . Suppose that the probability of the variate X falling in the infinitesimal interval x- 1 2 d x to x+ 1 2 d x is expressible as f(x) d x , where f(x) is a continuous function of x Symbolically, P (x- 1 2 d x X x+ 1 2 d x )=f(x) d x where f(x) is called the pro
Options
- A1 27
- B8 27
- C1 225
- D26 27
Correct answer
B. 8 27
Step-by-step solution
Probability that life of a radio tube is less than or equal to 150 hours = ₀¹⁵⁰ f(x) d x= ₁₀₀¹⁵⁰ 100 x^2 d x=- . 100 x |₁₀₀ ¹⁵⁰=-100 [ 1 150 - 1 100 ]= 1 3 Probability that life is greater than 150 hrs = 2 3 Probability that none of these have life less than on equal to 150 hrs = 2 3 2 3 2 3 = 8 27 ~h