Each of 12 refrigerators of a certain type has been returned to a distributor because of an audible, highpitched, oscillating noise when the refrigerators are running. Suppose that 7 of these refrigerators have a defective compressor and the other 5 have less serious problems. If the refrigerators are examined in random order, let X be the number among the first 6 examined that have a defective compressor. What is the probability that X exceeds its mean valueby more than 1 standard deviation?

0.121

Step-by-step explanation:

From the given information:

Let X be a hypergeometric random variable. i.e X h (x;:6,7,12)

To determine the mean and the standard deviation of X of a hypergeometric random variable; we have:

The standard deviation is :

However, the inequality for the event showcasing how X exceeds its mean value by more than 1 standard deviation is :

∴

10.416 meters per second

step-by-step explanation:

distance=1 00 meters

time= 9.6 seconds in decimal form or 9 3/5 as a mixed number

average speed= 100/9.6

=10.416 meters per second or 10 52/125 as a mixed number.