B. 7.5 / 7.5
ExplanationStep 1: Mean = sum divided by number of observations. Step 2: Sum is 30 and observations are 4 so mean is 7.5. Step 3: Include all values while finding mean.
Step 1: Mean = sum / number of observations है। Step 2: Sum 30 और observations 4 हैं इसलिए mean 7.5 है। Step 3: Mean में सभी values शामिल करें।
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