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प्रश्न
Find the mean of: all prime numbers between 20 and 40.
बेरीज
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उत्तर
All prime numbers between 20 and 40 are 23, 29, 31, 37
Sum of these observations = 23+29 + 31 + 37 = 120 .
and, number of their observations = 4
∴ Required mean = `120/4 = 30`
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