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avanturin [10]
2 years ago
6

Find next two terms. 10, -40, 160, ?,?

Mathematics
1 answer:
bija089 [108]2 years ago
3 0

Answer: -640, 2560

each number in the sequence is multiplied by -4 to get the next answer

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3 years ago
The probability model below describes the number of repair calls that an appliance repair shop may receive during an hour. Compl
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Answer:

a) So, she can expect a 2.4 calls per hour.

b) So, the standard deviation is 0.8.

Step-by-step explanation:

We know that probability model below describes the number of repair calls that an appliance repair shop may receive during an hour.

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a) We calculate how many calls should the shop expect per hour.

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E(X)=1\cdot0.1+2\cdot0.5+3\cdot0.3+4\cdot0.1\\\\E(X)=0.1+1+0.9+0.4\\\\E(X)=2.4

So, she can expect a 2.4 calls per hour.

b) We calculate the standard deviation:

\sigma=\sqrt{(1-2.4)^2\cdot 0.1+(2-2.4)^2\cdot 0.5+(3-2.4)^2\cdot 0.3+(4-2.4)^2\cdot 0.1}\\\\\sigma=\sqrt{0.196+0.08+0.108+0.256}\\\\\sigma=\sqrt{0.64}\\\\\sigma=0.8

So, the standard deviation is 0.8.

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or 6 to 9

Step-by-step explanation:


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