B. 30 / 30
ExplanationStep 1: Mean = total sum divided by observations. Step 2: Sum is 120 and observations are 4 so mean is 30. Step 3: Add all values for mean.
Step 1: Mean = total sum / observations होता है। Step 2: Sum 120 और observations 4 हैं इसलिए mean 30 है। Step 3: Mean के लिए सभी values जोड़ें।
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