The joint distribution for the length of life of two different types of components operating in a system is given by f(y1, y2) = 1 8 y1e−(y1 + y2)/2, y1 > 0, y2 > 0, 0, elsewhere. The relative efficiency of the two types of components is measured by U = Y2 Y1 . Find the probability density function for U. fU(u) = , u ≥ 0 0 , u < 0

11 feet 6 inches and 8 feet 6 inches

7! = 7×6×5×4×3×2

3! = 3× 2

as 7! is multiple of 3! because 7! contains 3! that is 3× 2 as factor

so 7! /(3! ) = 7× 6× 5× 4

= 42 × 20

= 840

its b) 840✌✌✌

dhruv⭐

24

step-by-step explanation:

the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is

30% × 80 = 0.30 × 80 = 24

step-by-step explanation: