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3 years ago

What would the answers be?

Mathematics

1 answer:

babunello [35]3 years ago

6 0

Is C and D because 10x^2-6x^2=36+64
4x^2=100
x^2=25
x= -5 or 5

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A teacher can grade 25 papers in 4 hours. How many papers can he grade in 6 hours?

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3 years ago

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Use the fact that the mean of a geometric distribution is μ= 1 p and the variance is σ2= q p2. A daily number lottery chooses th

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Answer:

a). The mean = 1000

The variance = 999,000

The standard deviation = 999.4999

b). 1000 times , loss

Step-by-step explanation:

The mean of geometric distribution is given as , $\mu = \frac{1}{p}$

And the variance is given by, $\sigma ^2=\frac{q}{p^2}$

Given : $p=\frac{1}{1000}$

= 0.001

The formulae of mean and variance are :

$\mu = \frac{1}{p}$

$\sigma ^2=\frac{q}{p^2}$

$\sigma ^2=\frac{1-p}{p^2}$

a). Mean = $\mu = \frac{1}{p}$

= $\mu = \frac{1}{0.001}$

= 1000

Variance = $\sigma ^2=\frac{1-p}{p^2}$

= $\sigma ^2=\frac{1-0.001}{0.001^2}$

= 999,000

The standard deviation is determined by the root of the variance.

$\sigma = \sqrt{\sigma^2}$

= $\sqrt{999,000}$ = 999.4999

b). We expect to have play lottery 1000 times to win, because the mean in part (a) is 1000.

When we win the profit is 500 - 1 = 499

When we lose, the profit is -1

Expected value of the mean μ is the summation of a product of each of the possibility x with the probability P(x).

$\mu=\Sigma\ x\ P(x)= 499 \times 0.001+(-1) \times (1-0.001)$

= $ 0.50

Since the answer is negative, we are expected to make a loss.

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2 years ago

Caroline spent $42.14 on groceries after using coupons and store discounts. Without the coupons and store discounts, the groceri

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The answers is 14%
49 multiply by 14% is 6.86
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26)A $45.00 purchase in Iowa totals $47.70 with tax and a $35.00 purchase in tennessee totals$37.70 with tax which state has a g

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What is the first step in determining if 6 is a solution to 3 x = 18?

andreev551 [17]

Answer:

Step-by-step explanation:I think it's C :)

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