Find the mean of the following set of test scores:
15.57
Context: Calculate the sum of the observations and divide by the total count ():\text{Sum} = 12 + 15 + 18 + 13 + 17 + 20 + 14 = 109$$$$\text{Mean} = \frac{109}{7} \approx 15.57
Grammar: Change the sentence from direct to indirect : He said, "I am happy"
TOEFL iBT Choose the structure that best completes the sentence: Not only _______ beautiful, but it is also highly functional.
Express in standard scientific form correct to 3 significant figures
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