Answer:
D. 1.2
Step-by-step explanation:
The sum of an arithmetic sequence is the product of the average term value and the number of terms.
The average term is often computed by averaging the first and last terms of the sequence. It can also be computed by averaging the middle two terms of the sequence (when there are an even number of terms, as here).
We are given a_13 is 1.9. We know that a_12 is 3.7 less, so is -1.8. Then the average of these two middle terms is ...
... (-1.8 + 1.9)/2 = 0.05
The product of this value and the number of terms (24) is ...
... 24·0.05 = 1.2 . . . . . the sum of 24 terms of the sequence
Answer: The answer is A. 3/5
Step-by-step explanation:
Cos is the X coordinate given in parenthesis.
The X coordinate is 0.6, so find the fraction which equals 0.6.
3/5 = 0.6
Answer:
Option B.
Step-by-step explanation:
Given information:
We need to find 95% confidence interval estimate for the difference between the means of two normally distributed populations.
Formula for confidence interval:
From the standard normal table it is clear that the z value at 95% confidence interval is 1.96.
Substitute the given values in the above formula.
The lower confidence limit is −18.78.
Therefore, the correct option B.
Answer:
The Answer is A. 2458.94
Step-by-step explanation:
Answer:
60
Step-by-step explanation: