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2 years ago

Helppppp idk how tu du dis

Mathematics

2 answers:

Arlecino [84]2 years ago

4 0

This expression simplified is 9n^4+8n^3+4

lubasha [3.4K]2 years ago

4 0

9n^4+8n^3+4

answer^^

hopefully that helped some?!!

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What is 1 1/2 mi in feet

Serga [27]

1 1/2 miles in feet is 7920

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2 years ago

Read 2 more answers

410−x/7 +70=120. please answer fast i will give brainliest

galben [10]

410 - x/7 +70 = 120
410+70-120=x/7
360=x/7
X =2520

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3 years ago

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Work out: x+3 5x-2 and x=8 <br> A)><br> B)<<br> C)=

Ilia_Sergeevich [38]

The correct answer is < (B)
8+3 is 11
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3 years ago

Rachel was an 85 average after four test. what does she need to earn on the next test if she wants to raise her average to exact

irakobra [83]

she took four tests with one more to take totals 5 tests

88 x 5 = 440

all her tests need to equal at least 440 to get an 88 average

since she has 85 average after 4, 85*4 = 340, so her 4 tests so far have equaled 340

440-340 = 100

she will need to get a 100 on her 5th test to have an 88 average

4 0

3 years ago

Stereo speakers are manufactured with a probability of 0.100.10 being defective. TwentyTwenty speakers are randomly selected. Le

olga nikolaevna [1]

Answer:

The expected value of X is 2 with a standard deviation of 1.34.

Step-by-step explanation:

For each speaker, there are only two possible outcomes. Either it is defective, or it is not. The probability of a speaker being defective is independent of other speakers. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

The expected value of the binomial distribution is:

$E(X) = np$

The standard deviation of the binomial distribution is:

$\sqrt{V(X)} = \sqrt{np(1-p)}$

Stereo speakers are manufactured with a probability of 0.1 of being defective

This means that $p = 0.1$

Twenty speakers are randomly selected.

This means that $n = 20$

Let the random variable X be defined as the number of defective speakers. Find the expected value and the standard deviation.

$E(X) = np = 20*0.1 = 2$

$\sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{20*0.1*0.9} = 1.34$

The expected value of X is 2 with a standard deviation of 1.34.

6 0

3 years ago