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In 2005, 0.75 proportion of all airline flights were on-time. If we choose a simple random sample of 2000 flights, find the probability that... (to four decimal places, using normal charts , no continuity correction)
(a) at least 77% of the sample's flights were on time: WebAssign will check your answer for the correct number of significant figures.
Incorrect: Your answer is incorrect.
(b) at least 1540 of the sample's flights were on time: WebAssign will check your answer for the correct number of significant figures.
Incorrect: Your answer is incorrect.
(c) the sample proportion of on-time flights (p-hat) differs from the truth by more than two percent: (0.02) WebAssign will check your answer for the correct number of significant figures.
Incorrect: Your answer is incorrect.
2.
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Gru's schemes have a/an 7% chance of succeeding. An agent of the Anti-Villain League obtains access to a simple random sample of 1100 of Gru's upcoming schemes.
Find the probability that...
(Answers should be to four places after the decimal, using normal charts , do NOT use the continuity correction):
...less than 101 schemes will succeed: WebAssign will check your answer for the correct number of significant figures.
Incorrect: Your answer is incorrect.
...more than 95 schemes will succeed: WebAssign will check your answer for the correct number of significant figures.
Incorrect: Your answer is incorrect.
...between 95 and 101 schemes will succeed: WebAssign will check your answer for the correct number of significant figures.
Incorrect: Your answer is incorrect.
...less than 8.5% of schemes will succeed: WebAssign will check your answer for the correct number of significant figures.
Incorrect: Your answer is incorrect.
...more than 9.5% of schemes will suceed: WebAssign will check your answer for the correct number of significant figures.
Incorrect: Your answer is incorrect.
...between 8.5% and 9.5% of schemes will succeed: WebAssign will check your answer for the correct number of significant figures.
Incorrect: Your answer is incorrect.
