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andrezito [222]
2 years ago
11

Please solve this question

Mathematics
1 answer:
ANTONII [103]2 years ago
3 0

The probability that a randomly selected x-value from the distribution will be in the interval:

  • P(35 < x < 45) = 0.6827 and,
  • P(30 < x < 40) = 0.47725

<h3>What is the probability of a normal distribution?</h3>

The probability of a normal distribution can be determined from the symmetrical curve between 1 to 100%.

From the information given:

  • Mean = 40
  • Standard deviation = 5

To determine the probability that a randomly selected x-value is in the given interval:

  • P(35<x<45)
  • P(30<x<40)

P(35 < x < 45) = P(\dfrac{35-40}{5} < Z < \dfrac{45-40}{5})

P(35 < x < 45) = P(\dfrac{-5}{5} < Z < \dfrac{5}{5})

P(35 < x < 45) = P(-1 < Z < 1)

\mathbf{P(35 < x < 45) = P[Z\le 1] -P[Z\le -1]}

Using normal distribution table:

P(35 < x < 45) = 0.8414 - 0.1587

P(35 < x < 45) = 0.6827

P(30 < x < 40) = P(\dfrac{30-40}{5} < Z < \dfrac{40-40}{5})

P(30 < x < 40) = P(\dfrac{-10}{5} < Z < \dfrac{0}{5})

P(30 < x < 40) = P(-2 < Z < 0)

\mathbf{P(30 < x < 40) = P[Z\le0]-P[Z\le -2]}

Using normal distribution table:

P(30 < x < 40) = 0.5 - 0.02275

P(30 < x < 40) = 0.47725

Learn more about the probability of a normal distribution here:

brainly.com/question/4079902

#SPJ1

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Answer:

B - 12,111

C - 11,589

Step-by-step explanation:

Here are the options

A - 10, 999

B - 12,111

C - 11,589

In order to round off to the nearest thousand, look at the hundred figure, if the number is greater or equal to 5, add 1 to the thousand figure. If this is not the case, add zero. Replace all the figures before the thousand figure with zero. i.e. the hundred ten, unit

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