David conducts his own study. He selects a random sample of 50 students and asks if they are getting 9 hours of sleep per night.
Thirty of the 50 students are not getting enough sleep.
Does David’s sample result provide convincing evidence that more than 50% of all students at the school are not getting enough sleep?
Does David’s sample result provide convincing evidence that more than 50% of all students at the school are not getting enough sleep?
1 answer:
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The measure of angle J is 19.8°, and the correct option is D.
<h3>What is the formula of cosine?</h3>The law of cosine or cosine rule in trigonometry is a relation between the side and the angles of a triangle. Suppose a triangle with sides a, b, c and with angles cosC.
The following formula is used to find the angle j is;
Triangle HIJ has side lengths h=12, i = 17, j = 7.
Substitute all the values in the formula;
Hence, the measure of angle J is 19.8°, and the correct option is D.
Learn more about law cosine here;
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