3 years ago

Help with number 2 please

Mathematics

1 answer:

lord [1]3 years ago

3 0

Answer:

Step-by-step explanation:

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Which expression represents that x was doubled and then decreased by 25% ?

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In a study of wait times at an amusement park, the most popular roller coaster has a mean wait time of 17.4 minutes with a stand

Ann [662]

Answer: A: 0.0031

Step-by-step explanation:

Given : In a study of wait times at an amusement park, the most popular roller coaster has a mean wait time of 17.4 minutes with a standard deviation of 5.2 minutes.

i.e. $\mu=17.4$ and $\sigma=5.2$

We assume that the wait times are normally distributed.

samples size : n= 30

Let x denotes the sample mean wait time.

Then, the probability that the mean wait time is greater than 20 minutes will be :

$P(x>20)=1-P(x\leq20)\\\\=1-P(\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}\leq\dfrac{20-17.4}{\dfrac{5.2}{\sqrt{30}}})\\\\=1-P(z\leq2.74)\ \ [\because\ z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}]\\\\=1-0.9969\ \ [\text{ By z table}]\\\\=0.0031$

Hence, the probability that the mean wait time is greater than 20 minutes.= 0.0031

Thus , the correct answer is A: 0.0031 .

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3 years ago

Find an ordered pair (x.y) that is a solution to the equation. 4x-y=8

sergiy2304 [10]

4x-y=8
-4x (subtract -4x from both sides)
-Y=-4x+8
/-y (divide -1y from both sides)
Y=4x-8

answer is: y=4x-8
(4,1)

6 0

3 years ago