Answer:
P( 44 < X < 56 ) = 0.12
Step-by-step explanation:
Number of seconds one gets to solve the puzzle ( X )
E( X ) = 100 + 0 ) / 2 = 50
Var ( X ) = 833.3333
бx = √833.3333 = 28.868
<u>Determine The approximate probability </u>
P( 44 < X < 56 ) = Δ time given / number of players selected
P( 44 < X < 56 ) = (56 - 44) / 100
= 12 / 100 = 0.12
Answer:
12.5 square yards.
Step-by-step explanation:
Let a square yard of carpet = x
The cost of installing a carpet is given by;
100 + 8x
The charge for installation
75 + 10x
The number of square yards of carpet for which the cost including carpet and installation is the same is given by;
100 + 8x = 75 + 10x
100 - 75 = 10x - 8x
25 = 2x
x = 25 / 2
x = 12.5 square yards.
10 trees in 2 hours = 5 trees per hour
150 trees * 1 hour/ 5 trees = 30 hours
30 cars in 5 hours = 6 cars per hour
120 cars * 1 hour/6 cars = 20 hours
it will take 20 hours to wash 120 cars.
25 letters per minute * 5 minutes = 125 letters
15000 phones per hour
300000 phones * 1hour/15000 phones = 20 hours
375 ft^2/ 15 min = 25 ft^2/min
It will take 30 hours to plant 150 trees
He can buy 6 lottery tickets.
Triangle XYZ is a right triangle.
What value should f be to yield 90 degrees?
6(3f - 15)°.
Let f be 8, 10, 12, 15.
When f = 10, we get 90 degrees for angle Z.
Z = 6(3•10 - 15)
Z = 6(30 - 15)
Z = 6(15)
Z = 90
Answer: Choice B.