Be observing the table, we can write the following conjecture:
When adding consecutive even numbers, starting from 2 to

.
Then the sum is equal to:

Then, the sum of the first 15 positive even numbers (which is the sum of 2 to 30) can be calculated with the previous conjecture by setting

:
The answer is 240.
Answer:
A. Millimeter
Step-by-step explanation:
eyelashes are very small
Let
n = number of data
s = standard deviation (sample)
S = standard deviation (population)
The working equations is

To find

, : (1 - 0.90)/2 = 0.05
To find

, : 1 - 0.05 = 0.95
Degrees of freedom = n-1 = 24 - 1 = 23
This is shown in the figure attached. Since there is no row for df=23, we interpolate. Thus,
Substitute all values,

Thus the answer is,
Answer: The answer is B.
Step-by-step explanation: