Answer:
520
Step-by-step explanation:
Let the Ratio a:b:c be 7x:13x:20x Respectively.
So, Sum of Ratios is 520...
A+B+C = 520
7x+13x+20x=520
40x=520
x= 520/40
x= 13
Now, Put the value of x
A= 7x= 7×13= 91
B= 13x = 13×13= 169
C= 20x = 20×13= 260
Now Add the numbers if we get 520 it means all the three numbers are correct....
91+169+260= 520
Answer:
A
Step-by-step explanation:
The average rate of change of f(x) in the closed interval [ a, b ] is
Here [ a, b ] = [ 3, 5 ] , thus
f(b) = f(5) = - 26 ← value of y for x = 5 from table
f(a) = f(3) = - 10 ← value of y for x = 3 from table
average rate of change = = = - 8 → A
What do you need help with?
Answer:
There is not enough evidence to conclude that the mean pH level is 8.5.
Step-by-step explanation:
We are given the following in the question:
Population mean, μ = 8.5
Sample mean, = 8.42
Sample size, n = 49
Alpha, α = 0.05
Sample standard deviation, s = 0.16
First, we design the null and the alternate hypothesis
We use two-tailed t test to perform this hypothesis.
Formula:
Putting all the values, we have
Now,
Since, the test statistic does not lies in the acceptance region, we fail to accept the null hypothesis and reject it. We accept the alternate hypothesis.
There is not enough evidence to conclude that the mean pH level is 8.5.