In a study of 250 adults, the mean heart rate was 70 beats per minute. Assume the population of heart rates is known to be appro
ximately normal with a standard deviation of 12 beats per minute. What is the 99% confidence interval for the mean beats per minute?
68.9 − 76.3
70 − 72
61.2 − 72.8
68 − 72
68.9 − 76.3
70 − 72
61.2 − 72.8
68 − 72
1 answer:
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Answer:
Step-by-step explanation:
We know that all angles in a triangle will add up to 180°. Since we know the measure of all 3 angles, we can create this equation:
Let's solve for x.
Combine like terms:
Add 15 to both sides:
Subtract 31 from both sides:
Divide both sides by 2:
So x is 82°.
Hope this helped!