1. in a batch of 10 items, we wish to extract a sample of 3 without replacement. how many
different samples can we extract?
2. let x and y be independent random variables. suppose the respective expected values
are e(x) = 8 and e(y) = 3 and the respective variances are v(x) = 9 and v(y) = 6. let z be
defined as z = 2x - 3y +5. based on these data, the value of e(z) is_ and the value
of v(z) is
3. the ratio of milk water in 55 liters of adulterated milk is 7: 4. how much water must be
added to make the mixture in a ratio of 7: 6?
a) 5 liters
b) 10 liters
c) 15 liters d) none of these

idk

step-by-step explanation:

i don't know

d. $180

step-by-step explanation:

if the dimensions of the room is 9ft by 12 ft, we have the area of the floor as,

so the area of the floor is 108 square feet, converting that into square yards we get,

the cost of carpet is $15 per square yard, therefore the cost of carpet for 12 square yards is,

hence, the cost of carpet is $180.

assuming the dimensions of the room be,

15 ft by 12 ft

so, the area of the floor of that room is,

we can convert 180 square feet into square yards, we know that,

1 sq ft = 0.111 sq yard

so, 180 square feet is,

so the area of floor is 20 square yards.

now, the cost of carpet is 15 dollars per square yard, therefore the cost of carpet for 20 square yards is,

so, it will cost $300.

answer: your answer is a