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3 years ago

Simplify the variable expression by evaluating its numerical part, and enter

Mathematics

1 answer:

Lera25 [3.4K]3 years ago

6 0

Answer:

Step-by-step explanation:

Given:

(7 - 6) • w

The numerical part is

(7 - 6)

= 1

The variable part is w

Therefore,

(7 - 6) • w

= 1 • w

= w

Note:

A number or a variable multiplied by 1 equals that same number or variable

So,

(7 - 6) • w = w

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Read 2 more answers

The daily revenues of a cafe near the university are approximately normally distributed. The owner recently collected a random s

lbvjy [14]

Answer:

The sample size to obtain the desired margin of error is 160.

Step-by-step explanation:

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$MOE=z_{crit}\times\dfrac{\sigma}{\sqrt{n}}$

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$n=\left[z_{crit}\times \dfrac{\sigma}{M}\right]^2$

Now the Margin of Error is reduced by 2 so the new M_2 is given as M/2 so the value of n_2 is calculated as

$n_2=\left[z_{crit}\times \dfrac{\sigma}{M_2}\right]^2\\n_2=\left[z_{crit}\times \dfrac{\sigma}{M/2}\right]^2\\n_2=\left[z_{crit}\times \dfrac{2\sigma}{M}\right]^2\\n_2=2^2\left[z_{crit}\times \dfrac{\sigma}{M}\right]^2\\n_2=4\left[z_{crit}\times \dfrac{\sigma}{M}\right]^2\\n_2=4n$

As n is given as 40 so the new sample size is given as

$n_2=4n\\n_2=4*40\\n_2=160$

So the sample size to obtain the desired margin of error is 160.

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4 years ago