The rates of on-time flights for commercial jets are continuously tracked by the u. s. department of transportation. recently, southwest air had the best reate with 80 % of its flights arriving on time. a test is conducted by randomly selecting 12 southwest flights and observing whether they arrive on time. (a) find the probability that exactly 4 flights arrive on time. (b) would it be unusual for southwest to have 9 flights arrive on time?

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step-by-step explanation:

told you

69.64%

step-by-step explanation:

she will sew have sewn five dresses   and be 1/3 done with the sixth one in an hour.

step-by-step explanation:

3/4 of an hour=45 mins

lucy makes 1 dress per 11.25 minutes

45 mins+11.25 mins=56.25 mins

60 mins- 56.25 mins=3.75 mins

3.75 mins is 1/3 of of 11.25 mins

therefore she the other 1/3 would be part of the hour and she will have sewn 5 dresses and begun the sixth.

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