Statistics

Step 1: Meaning of best performance.
Best performance means:
- High average (mean)
- Low variation (standard deviation)
Step 2: Compare coefficient of variation (CV).

Step 3: Compute CV for each class.
(A):

(B):

(C):

(D):

Step 4: Decide best class.
Lowest CV means most consistent performance.
Option (B) has lowest CV.
Final Answer:

We start by finding the range of . Step 1: Express in an alternate form Since the sine function satisfies , we obtain: Taking the modulus: Multiplying both sides by 2:
Step 2: Adjusting for the given function Final Answer: