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3 years ago

8

Mina is testing different types of heat lamps to determine which type is most effective for growing strawberry bushes. She purch

ases two different types of lamps from a local store. Mina applies brand A to one area of the yard and brand B to another area of the yard, both of which receive full sunlight. She waters the area with brand B daily; she waters the area with brand A every other day. At the end of the study, Mina concludes brand B is more effective in growing strawberry bushes. Is Mina's conclusion valid? Explain why or why not.

2 answers:

Nadya [2.5K]3 years ago

8 0

Answer:

Invalid

Step-by-step explanation:

atroni [7]3 years ago

4 0

Answer:

invalid

Step-by-step explanation:

she is using two brands and not watering them the same amount

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“Solve each inequality and graph its solution. Show work.”

Cloud [144]

Answer:

$p$ or $p >6$

Step-by-step explanation:

Given

$|-5-p| > 11$

Required

Solve and graph

$|-5-p| > 11$

Remove absolute bracket

$-5 - p > 11$ or $-5- p$

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$-p > 11 + 5$ or $-p < -11 + 5$

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3 years ago

Michael wrote all the number s from 3 to (n+5). How many numbers did Michael write.

Vitek1552 [10]

Answer:

$n-1$

Step-by-step explanation:

The amount of integers between $a$ and $b$ inclusive is always $|a-b|-1$ .

This means the amount of integers Michael wrote is $|(3)-(n+5)|-1=|-2-n|-1=|n+2|-1$ . Because $n+5>=3$ , which gives $n>=-2$ , $n+2$ is always non-negative. So, we can kick out the absolute value sign to get $n+2-1=n-1$ .

So, he wrote $\boxed{n-1}$ integers and we're done!

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3 years ago

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Dmitriy789 [7]

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4 years ago

Read 2 more answers

M5_A3. The expected project completion time for the construction of a pressure vessel is 18 monthsand the project variance is 7.

snow_tiger [21]

Answer:

a) 0.3520

b) 0.9884

c) 0.1292

d) 0.1292

e) 0.7648

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by

$Z = \frac{X - \mu}{\sigma}$

After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X.

In this problem, we have that:

The expected project completion time for the construction of a pressure vessel is 18 months. So $\mu = 18$ .

And the project variance is 7. The standard deviation is the square root of the variance, so $\sigma = \sqrt{7}$ .

a) What is the probability that the project will require at least 19 months?

The pvalue of the zscore of $X = 19$ is the probability that the project will require less than 19 months. So the probability that the project will require at least 19 months is the subtraction of 1 by this pvalue.

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{19 - 18}{\sqrt{7}}$

$Z = 0.38$

The pvalue of Z = 0.38 is 0.6480.

So the probability that the project will require at least 19 months is 1 - 0.6480 = 0.3520.

b) What is the probability that the project will be completed within 24 months?

This is the pvalue of the zscore of X = 24.

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{24 - 18}{\sqrt{7}}$

$Z = 2.27$

The pvalue of Z = 2.27 is .9884. This means that the probability that the project will be completed within 24 months is .9884.

c) What is the probability that the project will require at least 21 months?

Same logic as a). We find the pvalue of the zscore of X = 21, then we subtract 1 by this value.

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{21 - 18}{\sqrt{7}}$

$Z = 1.13$

The pvalue of Z = 1.13 is 0.8708.

So the probability that the project will require at least 21 months is 1 - 0.8708 = 0.1292.

d) What is the probability that the project will be completed within 15 months?

Same logic as b). This is the pvalue of the zscore of X = 15.

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{15 - 18}{\sqrt{7}}$

$Z = -1.13$

The pvalue of Z = -1.13 is .1292. This means that the probability that the project will be completed within 15 months is .1292.

e) What is the probability that the project will take between 16 and 24 months to complete?

This is the pvalue of Z = 24 subtract by the pvalue of Z = 16.

In b), we found that the pvalue of Z = 24 is .9884

Now we find the pvalue of Z = 16

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{16 - 18}{\sqrt{7}}$

$Z = -0.76$

The pvalue of Z = -0.76 is 0.2236

So the probability that the project will take between 16 and 24 months to complete is 0.9884 - 0.2236 = 0.7648

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4 years ago

Marco is investigating some of the business models of SureSpin, one of Faster Fidget's top competitors. He has learned that they

VARVARA [1.3K]

Answer:

$13,450

Step-by-step explanation:

The fixed costs of production, are the costs incurred that are independent from the production volume, that is, regardless of how many spinners the company produces, those costs will remain the same. If 'x' is the number of spinners produced, interpreting the cost function, we can see that it costs $1.28 to produce each spinner and that there is a cost that does not rely on production of $13,450. Therefore, the fixed cost of production is $13,450.

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4 years ago