3 years ago

X= 0 , 1 , or 7 Y= -10, 5, or 10 Please helppppp will mark Brainliest

Mathematics

2 answers:

vlabodo [156]3 years ago

6 0

Step-by-step explanation:

aksik [14]3 years ago

6 0

Answer: x=7

y=5

im not 100% sure so pls b careful

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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

Blababa [14]

Let $X$ be the random variable for the number of marks a given student receives on the exam.

10% of students obtain more than 75 marks, so

$P(X>75)=P\left(\dfrac{X-\mu}\sigma>\dfrac{75-\mu}\sigma\right)=P(Z>z_1)=0.10$

where $Z$ follows a standard normal distribution. The critical value for an upper-tail probability of 10% is

$P(Z>z_1)=1-F_Z(z_1)=0.10\implies z_1=F_Z^{-1}(0.90)$

where $F_Z(z)=P(Z\le z)$ denotes the CDF of $Z$ , and $F_Z^{-1}$ denotes the inverse CDF. We have

$z_1=F_Z^{-1}(0.90)\approx1.2816$

Similarly, because 20% of students obtain less than 40 marks, we have

$P(X$

so that

$P(Z$

Then $\mu,\sigma$ are such that

$\dfrac{75-\mu}\sigma\approx1.2816\implies75\approx\mu+1.2816\sigma$

$\dfrac{40-\mu}\sigma\approx-0.8416\implies40\approx\mu-0.8416\sigma$

and we find

$\mu\approx53.8739,\sigma\approx16.4848$

3 0

3 years ago

Please help will give Brain!!

leonid [27]

Answer:

Step-by-step explanation:

You are correct. It's 8/5

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2 years ago

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How to get a factor of a number

weeeeeb [17]

For instance, the factors of 15 are 3 and 5, because 3×5 = 15. Some numbers have more than one factorization (more than one way of being factored). For instance, 12 can be factored as 1×12, 2×6, or 3×4. A number that can only be factored as 1 times itself is called "prime".

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Samantha invested $880 in an account paying an interest rate of 3.1% compounded

irakobra [83]

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dezoksy [38]

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3 cats divided by 10 = 9 remainder 1 and 3 times 3 = 9.

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2 years ago