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miv72 [106K]
3 years ago
5

Please answer I’m not good with math

Mathematics
2 answers:
Georgia [21]3 years ago
5 0
AngleGEF, the first option!!
guapka [62]3 years ago
3 0

Answer: A

Step-by-step explanation:

it's easy

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The lifespan (in days) of the common housefly is best modeled using a normal curve having mean 22 days and standard deviation 5.
Natasha_Volkova [10]

Answer:

Yes, it would be unusual.

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal probability distribution

Problems of normally distributed samples are 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}

The Z-score measures how many standard deviations the measure is from the mean. 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, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

If Z \leq -2 or Z \geq 2, the outcome X is considered unusual.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

In this question, we have that:

\mu = 22, \sigma = 5, n = 25, s = \frac{5}{\sqrt{25}} = 1

Would it be unusual for this sample mean to be less than 19 days?

We have to find Z when X = 19. So

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

By the Central Limit Theorem

Z = \frac{19 - 22}{1}

Z = -3

Z = -3 \leq -2, so yes, the sample mean being less than 19 days would be considered an unusual outcome.

7 0
3 years ago
Can any y’all help me? I got what x is but idk y. Thxxxxxx
kotegsom [21]

Answer:

y should be 5, when u solve for the angles u get 68+87+c=180, if c is y^2 then y is 5

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Can someone help me???
amm1812

Answer:

r=-189

Step-by-step explanation:

Do U want a Step by step explanation?

8 0
3 years ago
A 40 foot ladder is set against the side of a house so that it reaches up 24 feet. If Aiden grabs the ladder at its base and pul
Nataly [62]

Answer:12

Step-by-step explanation:

3 0
3 years ago
Twice the difference of a number and 2 is 9
likoan [24]
2(n-2)=9
That's the answer. U just set it up as it is written
6 0
3 years ago
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