Answer: 192
Step-by-step explanation:
3 x 8 = 24
24 x 8 = 192
X = 60 degrees.
the triangle is equiangular. All angles are 60 degrees
A) The empirical rule tells you the probability of being within 1 standard deviation of the mean is 68%.
b) The probability that the sample mean falls within 3 standard deviations* of the mean is 99.7%.
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* The standard deviation of the sample mean is 1/√9 = 1/3 of the standard deviation of an individual sample. Hence the same limits (90-110) now cover 3 standard deviations of the sample mean.
Answer: The correct answer is 19 sit ups.
Step-by-step explanation: Given that the regression equation to find a a relationship between hours of TV watched per day (x) and number of situps a person can do (y) was done.
The result was
y = ax+b
Correlation coefficient = 0.865
To predict the number of situps a person who watches 3 hours of TV
y = -1.23(3)+22.738
= 19.048
Approximately 19 situps.
Set a ratio. a=3b. a+b=5. Therefore, 3b + b = 5. 4b= 5. If b=5/4, then a is 3 times as much, which is 15/4 = a.