3 years ago

2x(4+2)-(12/4) I need that asp

Mathematics

1 answer:

Sergio039 [100]3 years ago

5 0

Answer:

8x=1

Step-by-step explanation:

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Step-by-step explanation:

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A long distance phone call between two cities costs $8.50 for 17 minutes. What is the rate in cents per minute?

Ira Lisetskai [31]

Answer:

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Step-by-step explanation:

8.50 divided by 17= 0.50

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kramer

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The annual 2-mile fun-run is a traditional fund-raising event to support local arts and sciences activities. It is known that th

victus00 [196]

Answer: 0.0228

Step-by-step explanation:

Given : The mean and the standard deviation of finish times (in minutes) for this event are respectively as :-

$\mu=30\\\\\sigma=5.5$

If the distribution of finish times is approximately bell-shaped and symmetric, then it must be normally distributed.

Let X be the random variable that represents the finish times for this event.

z score : $z=\dfrac{x-\mu}{\sigma}$

$z=\dfrac{19-30}{5.5}=-2$

Now, the probability of runners who finish in under 19 minutes by using standard normal distribution table :-

$P(X$

Hence, the approximate proportion of runners who finish in under 19 minutes = 0.0228

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3 years ago