B. 5 / 5
ExplanationStep 1: Mean = total sum / number of observations. Step 2: The sum is 20 and there are 4 observations so mean is 5. Step 3: For mean first add all values.
Step 1: Mean = total sum / number of observations। Step 2: sum 20 और observations 4 हैं इसलिए mean 5 है। Step 3: Mean के लिए पहले सभी values जोड़ें।
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