I Disaster Airlines Determined That the Mean Number of Passengers

question 78

Multiple Choice

i. Disaster Airlines determined that the mean number of passengers per flight is 152 with a standard deviation of ten passengers. Practically all flights have between 142 and 162 passengers. ii. The total area under the normal curve is less than 1.
iii. The mean of a normal probability distribution is 500 and the standard deviation is 10.
About 68 percent of the observations lie between 480 and 520.

• A) (i), (ii), and (iii) are all correct statements.
• B) (i) is a correct statement but not (ii) or (iii).
• C) (i) and (iii) are correct statements but not (ii).
• D) (i) and (ii) are correct statements but not (iii).
• E) (i), (ii), and (iii) are all false statements.

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