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Sliva [168]
3 years ago
15

Chapter 1 Math Review----the test will look very similar to these questions. Make sure

Mathematics
1 answer:
Bezzdna [24]3 years ago
8 0

Answer:

a. is 5

c. is 3

e. is 6

b. is 1

d. is 4

f. is 2

Step-by-step explanation:

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Suppose that the probabilities are 0.4, 0.3, 0.2, and 0.1, respectively, that 0, 1, 2, or 3 power failures will strike a certain
defon

Answer:

mean = 1 power failure

variance = 1 (power failure)²

Step-by-step explanation:

Since the mean is computed as

mean = E(x) = ∑ x * p(x) for all x

then for the random variable x=power failures , we have

mean = ∑ x * p(x) = 0 * 0.4 + 1* 0.3 + 2*0.2 + 3* 0.1 = 1 power failure

since the variance can be calculated through

variance =  ∑[x-E(x)]² * p(x) for all x

but easily in this way

variance = E(x²) -  [E(x)]² , then

E(x²) = ∑ x² * p(x) = 0² * 0.4 + 1²* 0.3 + 2²*0.2 + 3²* 0.1 = 2 power failure²

then

variance = 2 power failure² - (1 power failure)² = 1 power failure²

therefore

mean = 1 power failure

variance = 1 power failure²

7 0
3 years ago
Help ASAP (Math) will give brainiest and points!!
nordsb [41]

Answer:

2.17 \times 10^{-1}

Step-by-step explanation:

(7 \times 10 ^{-6}) + 0.26 - (5 \times 10^{-2}) = \frac{7}{10^3} + \frac{26}{10^2}-\frac{5}{10^2}

                                              = \frac{7 + (26 \times 10) - ( 5 \times 10)}{10^3}\\\\=\frac{7 + 260 - 50 }{10^3}\\\\=\frac{217}{10^3}\\\\= 2.17 \times 10^2 \times 10^{-3}\\\\= 2.17 \times 10^{-1}

3 0
2 years ago
Arrange the decimal fractions in descending order.<br>1.3 0.13 3.1 0.31<br>​
SVEN [57.7K]

Answer:

0.13 0.13 3.1.3

Step-by-step explanation:

Hope it's answer you plz mark as Brainlist

3 0
3 years ago
8y + 4x + 6y=? Plz help
postnew [5]

Answer:

idk, sorry about that one

8 0
3 years ago
Read 2 more answers
Read the passage.
alexandr1967 [171]

Answer:

D sentence 5

Step-by-step explanation:

6 0
3 years ago
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