In a sample of 400 customers, 140 say that service is poor. You select two customers without replacement to get more information on their satisfaction. What is the probability that both say service is poor?

= 973 / 7890  

Step-by-step explanation:

P (A∩B) = P (A) * P (B║A)

P (A) = 140 / 400

= 7/20

Because it is without replacement this is a conditional probability of an event with respect to another event;

P (B║A) = 139/399

P (A∩B) = 7/20 * 139/399

= 973 / 7890  

2 x^2 -3x+p

sum of roots = 3/2

let other root be x

3+ x = 3/2

x= 3/2 - 3 = -3/2

product of roots = p/2

3× -3/2 = p/2

-9 = p

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14 ft 7 inches

step-by-step explanation:

since each model inch corresponds to 25 real inches, 7 model inches will correspond to

7×25" = 175"

at 12" per foot, that is 14 feet, 7 inches.