The scores on a driver's test are normally distributed with a mean of 100.Find the score that is 2 standard deviations below the mean, if the standard deviation is 27.
A. 127
B. 73
C. 154
D. 46
Answer: D
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A computer password is made up of four characters. Each character can be a capital letter (A through Z), a lowercase letter (a through z) or a digit (0 through 9).How many different such computer passwords are there?
A. 462 B. 2 × 264 + 104 C. 62 × 4 D. 624 E. none of these
Subtract.-5 - 21
A. -16 B. 16 C. 26 D. -26
Simplify the radical. Indicate if the radical is not a real number. Assume that x represents a positive real number.
A. 3 B. 4 C. ±2 D. 2
Use Bayes' rule to find the indicated probability.Two stores sell a certain MP3 players. Store A has 34% of the sales, 5% of which are of defective items, and store B has 66% of the sales, 1% of which are of defective items. The difference in defective rates is due to different levels of pre-sale checking of the product. A person receives a defective item of this product as a gift. What is the probability it came from store B?
A. 0.275 B. 0.22 C. 0.5667 D. 0.7083