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3 years ago

11

9(n+3)=7n-3 and steps please

1 answer:

Grace [21]3 years ago

6 0

9n + 27 = 7n -3
2n + 27 = -3
2n = -30
n = -15

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Step-by-step explanation:

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3 years ago

Genetic Defects Data indicate that a particular genetic defect occurs in of every children. The records of a medical clinic show

Dovator [93]

Complete Question

The complete question is shown on the first uploaded image

Answer:

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Looking at the value for this probability we see that it is not so small to the point that the observation of this kind would be a rare occurrence

Step-by-step explanation:

From the question we are told that

in every 1000 children a particular genetic defect occurs to 1

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The probability of observing the defect is mathematically evaluated as

$p = \frac{1}{1000}$

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The standard deviation of this probability is mathematically represented as

$\sigma = \sqrt{npq}$

Substituting values

$= \sqrt{50000 * 0.001 * 0.999}$

$= \sqrt{49.95}$

$= 7.07$

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$P(x \ge 60)$

in standardizing the normal distribution the normal area used to approximate $P(x \ge 60)$ is the right of 59.5 instead of 60 because x= 60 is part of the observation

The z -score is obtained mathematically as

$z = \frac{x-\mu }{\sigma }$

$= \frac{59.5 - 50 }{7.07}$

$=1.34$

The area to the left of z = 1.35 on the standardized normal distribution curve is 0.9099 obtained from the z-table shown z value to the left of the standardized normal curve

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The total area under the curve is 1

So

$P(x \ge 60) \approx P(z > 1.34)$

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$=1-0.9099$

$=0.0901$

3 0

3 years ago