In a class of 25 students, 14 have a brother and 17 have a sister. There are 5 students who do not have any siblings. What is th
e probability that a student who has a brother also has a sister?
2 answers:
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Answer:
(0.5793, 0.6363)
Step-by-step explanation:
Given that a poll of 793 adults aged 18 or older asked about purchases that they intended to make for the upcoming holiday season. One of the questions asked about what kind of gift they intended to buy for the person on whom they would spend the most. Clothing was the first choice of 482 people.
i.e. sample proportion p=
Std error of p =
For 90% Z crtiical = 1.645
Hence margin of error = 1.645 * std error = 0.0285
Confidence interval 90%
= proportion ±margin of error
=
The answer is C) 30 I hope this helped
