the performance of one brand of batteries. To investigate, the researchers
purchased 24 of these batteries and ran them until they died. This sample
lasted a mean of 47 hours with a standard deviation of 3 hours.
a) What assumption must we make about battery life in order to use a t
model?
b) Find a 95% confidence interval for the mean lifespan of this brand of
batteries.
c) Write a conclusion based on your confidence interval.
middle half of the data. Find the interquartile
range for the data set: 10, 3, 7, 6, 9, 12, 13.
A 12
© 6
B 7
D 8
The fraction of the workbook he should expect to complete in 1 hour is 5/12
The student's rate is given as:
1/4 of a workbook in 3/5 hour.
The rate in this scenario is calculated using:
Rate = Workbook/time
So, we have:
Rate = 1/4 / 3/5
Express as product
Rate = 1/4 * 5/3
Evaluate
Rate = 5/12
This means that she would complete 5/12 of the workbook in 1 hour
Hence, the fraction of the workbook he should expect to complete in 1 hour is 5/12
Read more about rates at:
#SPJ2
2. 5
3.2
4. 7
The required coefficient in the given expression 5a² - 7 is 5. Option 2. is correct.
The coefficient in the expression 5a² - 7 is the numerical value that multiplies the variable term, which is "a²" in this case.
In the expression 5a² - 7, the coefficient is the number that multiplies the variable term, which is a². Here, the coefficient is 5. It determines the scale or magnitude of the term with respect to the variable a. The constant term -7 does not have a coefficient as it is not multiplied by any variable.
The coefficient is 5.
So, the correct answer is option 2: 5.
Learn more about expression here:
#SPJ6
Answer:
a or b
Step-by-step explanation:
i did the math and sorry i suck at explaining
Find out X
Answer:
x = 6/9
Step-by-step explanation:
9x - 2(x+8) = 5x - 11(2-x)
9x - 2x - 16 = 5x -22 + 11x
collect the like terms
7x - 16 = 5x -22 + 11x
7x-5x = -22 +16 + 11x
2x = -6 + 11x
6 = 11x - 2x
6 = 9x
divide both sides by 9
6/9 = x