In a study of 250 adults the average heart rate was 70 bpm assume the population of heart rates is known to be approximately normal with a standard deviation of 12 bpm what does a margin of error of 2 for the 98% confidence interval of the average beats per minutes mean?
There is a a 1% chance that the population mean is less than 70 bpm.
There’s a 1% chance that the population mean is more than 70 bpm.
There is a 99% chance that the population mean is between 58 and 82 bpm.
There is a 99% chance that the population mean is between 68 and 72 bpm.

c-4 is the final answer! : )

93.8

step-by-step explanation:

lets say, first number = x

second number = 3x+7

total = 49

(x)+(3x+7)= 49

4x+7 = 49

4x = 42

x = 42/4

x= 10.5

x= 10.5

3x+7 = 3(10.5)+7 = 93.8

hope this

incomplete question. how do you expect anyone to you when you do not post the question in its entirety?

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)