69.9
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Given:
First 10 term of a geometric series are:

To find:
The expression that represents the sum of the series.
Solution:
The first term of the given geometric series is:

The common ratio of the given geometric series is:




The sum of first n terms of a geometric sequence is:

Where r is the common ratio.
Putting
in the above formula, we get

Therefore, the correct option is C, i.e.,
.
The ration is 10/7
Divide 55 and 35 by 5 to reduce the fraction of 55/35 and you get 10/7
Answer:


Step-by-step explanation:
For this case we have the following info given:
Treatment: 12 13 15 19 20 21 24
Control: 18 23 24 30 32 35 39
We can find the sample mean and deviations with the the following formulas:


And repaplacing we got:
the sample mean for treatment
the sample mean for treatment
the sample deviation for treatment
the sample deviation for control
the sample size for each sample
The degrees of freedom are given by:

The confidence interval for the difference of means is given by:
The confidence is 98% so then the significance is
and
. Then the critical value would be:

And replacing we got:

