Explanation by: Punit Bajpai
Prime number-a number that is divisible only by itself and 1 (e.g. 2, 3, 5, 7, 11).
Then the total prime number b/w 30 to 50=31,37,39,41,43,47
Now average=(31+37+39+41+43+47)/6=39.666667,
Approximate=39.8
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