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slavikrds [6]
3 years ago
12

Thirty randomly selected students took the calculus final. If the sample mean was 89 and the standard deviation was 6.2, constru

ct a 99% confidence interval of the mean score of all students. Assume that the population has a normal distribution
Mathematics
1 answer:
Ede4ka [16]3 years ago
5 0
For the answer to the question above asking <span>If the sample mean was 89 and the standard deviation was 6.2, construct a 99% confidence interval of the mean score of all students. Assume that the population has a normal distribution</span>
z=2.57 cuts off .005 in each tail of the standard normal distribution
99% CI is 89 +/- 2.57(6.2)/sqrt(30)= 89 +/- 2.909, or from 86.09 to 91.91
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Solving rational equations<br><br> solve for x: 3/x-4=7/x
KIM [24]

Solving the rational equation \frac{3}{x-4}=\frac{7}{x} the value of x is 7

Step-by-step explanation:

We need to solve rational equation: \frac{3}{x-4}=\frac{7}{x} and find value of x.

Solving:

\frac{3}{x-4}=\frac{7}{x}

Cross multiplying:

3(x)=7(x-4)\\Simplifying:\\3x=7x-28\\3x-7x=-28\\-4x=-28\\x=-28/-4\\x=7

So, value of x = 7.

Solving the rational equation \frac{3}{x-4}=\frac{7}{x} the value of x is 7

Keywords: Solving the rational equation

Learn more about Solving the rational equation at:

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Read 2 more answers
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Nimfa-mama [501]
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Step-by-step explanation:

The function that best describes the graph is y = (x - 1)² (C).

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