3 years ago

Which choice is equivalent to the expression below?

Mathematics

1 answer:

lawyer [7]3 years ago

8 0

Hopes this helps if I am wrong I am so sorry:

Answer: B.

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Calculate the upper and lower limit for a 95% confidence interval about this mean. a family needs a new car, but isn't sure they

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Answer: Where:
θ = confidence value
n = number of observations
μ = mean
Θ = standard deviation
... then your interval will be:
μ - θΘ/√n ≤ X ≤ μ - θΘ/√n
For some reason they want you to calculate the standard error, which is the Θ/√n section, and I mentioned the 1.96 value, so the above equation simplifies to: μ - 1.96SE ≤ X ≤ μ - 1.96SE

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3 years ago

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4 years ago

So you have 21 people that you want to have meet in groups of 3. How many rounds of meeting would it take to have them all meet?

irina1246 [14]

Answer:

1330 rounds of meetings

Step-by-step explanation:

You have a total of 21 people, and they all want to meet with each other in groups of 3. This means we are dealing with a combination problem, where combination is the selection of items in which order does not matter.

Formula for combination:

ₙCᵣ = $\frac{n!}{r!(n-r)!}$

where n is the total number of objects (in this case, total number of people: 21), and r is the sample set (in this case, groups: 3).

We plug in and get:

-> $\frac{21!}{3!(21-3)!}$

-> 1330 different meetings for everyone to meet with each other in groups of 3.

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3 years ago