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2 years ago

12

A person on a moving sidewalk travels 21 feet in seven seconds. The moving sidewalk has a length of 180 feet. How long will it t

ake to move from one end of the sidewalk to the other?

2 answers:

rodikova [14]2 years ago

8 0

60 seconds is the right answer

Kruka [31]2 years ago

7 0

56 seconds because 21 goes into 180 8 times. 7 multiplied by 8 is 56, so 56 is your answer.

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how many grams of a 15 percent alcohol solution should be mixed with 40 grams of a 30 percent solution to obtain a solution that

quester [9]

According to my calculations it should be 77

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2 years ago

Body fat percentage was found to be 16.5% and the person weighs 124 pounds what part in pounds of the body weight is fat

puteri [66]

Answer:

20.46 pounds

Step-by-step explanation:

Since 16.5% of their body is fat you need to multiply the weight by that percentage
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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.

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2 years ago

How would I add the fractions?<br><br> <img src="https://tex.z-dn.net/?f=-2%2F5%20%2B%202%2F3p%20%2B1%2F3p%20%3D%202p%20-%2016%2

LiRa [457]

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\\\\\\
\cfrac{(3\cdot -2)+(5\cdot 2p)+(5\cdot p)}{15}=\cfrac{(5\cdot 2p)-16}{5}
\\\\\\
\cfrac{-6+10p+5p}{15}=\cfrac{10p-16}{5}\impliedby \textit{now we cross-multiply}
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2 years ago

Is Neo Politan Waifu

timofeeve [1]

Answer:

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3 years ago