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Masteriza [31]
2 years ago
5

1 + 1 = ??? FLOORCHEESEI WUV U https://brainly.com/app/profile/49317028/answers

Mathematics
1 answer:
Likurg_2 [28]2 years ago
4 0

Answer:

It is 2...WONYONE

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Hello! answer: 13

Hope that helps!

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Add the two expressions. 8.9x−5 and −6.8x+8
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the marks in an examination for a Physics paper have normal distribution with mean μ and variance σ2 . 10% of the students obtai
ipn [44]

Answer:

The mean of the distribution is about 53.9 and standard deviation is about 16.5 marks.

Step-by-step explanation:

Use the trick of transforming the given random variable one that is standard normal distributed, aka a z-score, then look up the two percentile values in z-score tables to get two equations with two unknowns.

So, let x be the variable describing the marks of a student, and

z=(x-\mu)/\sigma

the standardized equivalent of that (mu - mean, sigma - standard deviation).

We are looking for values of mu and sigma. At this point we'd be out of luck, but, wait, we're given two bits of info: the 10% point (aka, 90th percentile) and the 20% point (can be interpreted as 100-20th percentile). For each point we can use z-score tables to look up the corresponding values of z (just search for z tables). I found:

z-score for the 10% point: z_10=1.28

z-score for the 20% point: z_20=-0.84

That gives us two equations:

z_{10}=1.28=(75-\mu)/\sigma\\z_{20}=-0.84=(40-\mu)\sigma

and can be solved for mu and sigma (do the work on your end, I am showing my result):

\mu=53.87\,\,,\,\, \sigma=16.51

The mean of the distribution is about 53.9 and standard deviation is about 16.5 marks.

3 0
3 years ago
Find the valué of x and y
Ugo [173]

Answer:

i think it is the 2nd option tell me if i am wrong

Step-by-step explanation:

it seems the most logical answer

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Because she doesn't receive any interest on the last month, but puts money in, we can write this equation:

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She will have $1452 On the eighteenth month

6 0
3 years ago
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