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Lubov Fominskaja [6]
2 years ago
7

Help please ASAP hsksbeishehsodb

Mathematics
2 answers:
VikaD [51]2 years ago
7 0

Answer:

D

Step-by-step explanation:

marishachu [46]2 years ago
4 0

Answer:

Experimental prob

Step-by-step explanation:

Experimental means you actually did it thats why its called experimental.

Theoretical means a guess in the future

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Simplify the expression. 9r 3r2 – 5r 7
Ksenya-84 [330]
Your final answer is going to be 4r + 3r ^2 +7
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If 25 Y - 80 is equal to minus 50 then the value of Y is
Murrr4er [49]

Answer:

Answer:25y=-50+80

25y=30

y=30/25

y=6/5....this is ur answer

Step-by-step explanation:

Step-by-step explanation:

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The sales tax for an item was $24.50 and it cost $350 before tax. Find the sales tax rate.
Karo-lina-s [1.5K]
Find the number that when multiplied with 350 will give you 24.5. This number happens to be .07 or in terms of sales tax, 7%.
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3 years ago
A study of peach trees found that the average number of peaches per tree was 725. The standard deviation of the population is 70
TEA [102]

Answer:

She needs to sample 189 trees.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

That is z with a pvalue of 1 - 0.025 = 0.975, so Z = 1.96.

Now, find the margin of error M as such

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

The standard deviation of the population is 70 peaches per tree.

This means that \sigma = 70

How many trees does she need to sample to obtain an average accurate to within 10 peaches per tree?

She needs to sample n trees.

n is found when M = 10. So

M = z\frac{\sigma}{\sqrt{n}}

10 = 1.96\frac{70}{\sqrt{n}}

10\sqrt{n} = 1.96*70

Dividing both sides by 10:

\sqrt{n} = 1.96*7

(\sqrt{n})^2 = (1.96*7)^2

n = 188.2

Rounding up:

She needs to sample 189 trees.

3 0
3 years ago
PLS HELP MEE I NEED THUS REAL BADD!!! I'LL GIVE BRANLIESTT!!!
Cloud [144]

Answer:

B is the correct answer. The two median numbers are 88 and 92. If you find the average of those, you get 90. Therefore, the median is 90.

Step-by-step explanation:

3 0
2 years ago
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