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pls answer fast pls
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1. 4 (sum of all no./ total no. of obs.)
2. 7 (same formula used for solving 1.)
3. 120 (mean×no. of obs.)
4. 4.25 (first four prime no. are 2,3,5,7)
5. 15 (find the sum of 4 no. by formula used in solving 3 and then subtract the sum of three digit from the sum u find by mean×no. of obs.)