Answer: 164
Step-by-step explanation: 656
/4
164
Answer:
a = ±23
Step-by-step explanation:
[67.9 %, 82.1 %] is the 95% confidence interval for the proportion of test-takers answering the question correctly. So we have [67.9 %, 82.1 %] In a random sample of 144 test-takers with 75% answered the question correctly. So the answer in this question is [67.9 %, 82.1 %].
Answer: The probability of a randomly chosen customer to be a woman who spends at least $250 is 0.18 or 18%
Step-by-step explanation:
60% of the customers are women, and 30% of the women spend at least $250.
We want to find the probability for a randomly selected customer to be a woman that spends at least $250
first, the probability of a random customer to be a woman is 60% or 0.6 in decimal form.
And 30% of those 60% spend at least $250, so the probability the product of those two, this is:
P = 0.6*0.3 = 0.18
So the probability of a randomly chosen customer to be a woman who spends at least $250 is 0.18 or 18%
