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harina [27]
3 years ago
12

The grades for the latest statistics exam are normally distributed. The mean was 93 with a standard deviation of 4. What is the

probability that you will receive a grade
that is between 89 and 97 on this exam?
О 99.74%
47.72%
O 95.44%
68.24%
Mathematics
1 answer:
olga_2 [115]3 years ago
3 0

Answer:68.27%

Step-by-step explanation:

TI84

2nd distr

normalcdf(89,97,93,4)

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The equation of the ellipse in <em>standard</em> form is (x + 3)² / 100 + (y - 2)² / 64 = 1. (Correct choice: B)

<h3>What is the equation of the ellipse associated with the coordinates of the foci?</h3>

By <em>analytical</em> geometry we know that foci are along the <em>major</em> axis of ellipses and beside the statement we find that such axis is parallel to the x-axis of Cartesian plane. Then, the <em>standard</em> form of the equation of the ellipse is of the following form:

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Now, we proceed to find the vertex and the lengths of the semiaxes:

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The equation of the ellipse in <em>standard</em> form is (x + 3)² / 100 + (y - 2)² / 64 = 1. (Correct choice: B)

To learn more on ellipses: brainly.com/question/14281133

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