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Luba_88 [7]
3 years ago
7

Lizzy took a history test.she answered 34 questions correct and 16 questions incorrectly.

Mathematics
1 answer:
alex41 [277]3 years ago
6 0

Answer:

52.95% (I'd actually round and just go with 53%)

Step-by-step explanation:

Divide 16 by 34, then multiply by 100 to get it to a percent (47.05%). Then you subtract the percent from 100 to find the amount Lizzy got correct (52.95%)

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Find f(-2).<br> A. 4<br> B. 8<br> C. 10<br> D. 20
il63 [147K]

Answer:

D. 20

Step-by-step explanation:

First, we need to plug in -2 to all the spots where x are. The new equation we have then is f(-2)= 2(-2)^2 - 3(-2) + 6. Then, we plug in the exponent to get 2(4) - 3(-2) + 6. We can then multiply to get 8 + 6 (since the three was negative as well) + 6, which equals 20.

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2 years ago
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Write five numbers that round up to 600
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3 years ago
Blood type AB is the rarest blood type, occurring in only 4% of the population in the United States. In Australia, only 1.5% of
Umnica [9.8K]

Answer:

a. X is a binomial random variable with n = 50 and p = 0.04

b. Y is a binomial random variable with n = 40 and p = 0.015

Step-by-step explanation:

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

X: the number of US residents (out of 50) with blood type AB.

Blood type AB is the rarest blood type, occurring in only 4% of the population in the United States

This means that p = 0.04, n = 50

Y: the number of Australians (out of 40) with blood type AB.

In Australia, only 1.5% of the population has blood type AB.

This means that p = 0.015, n = 40

Z: the total number of individuals (out of 90) with blood type AB.

Here

n = 90, p = 0.04*\frac{50}{90} + 0.015*\frac{40}{90} = 0.0289

Which of the following is true about the random variables X, Y, and Z?

Options a and b are true, while c is false.

7 0
3 years ago
I need help fast please and no fies
givi [52]

Answer:

x=-16

Step-by-step explanation:

from x=-3 to get to y=12 u need to multiply x=-3 by -4 to get to 12 so for y=64 u need to divide by -4 which equals x=-16

4 0
3 years ago
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lilavasa [31]

Answer:

<h2>=2⁵</h2><h2>it's option B 2⁵</h2><h2>(B) 2⁵ is the right option</h2>

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2 years ago
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