Find the Mean , Variance & Standard Deviation of frequency grouped data table

[@RealQinnMalloryu4]

20/2=10 22/2 =11 {10+11}=21 10^11 5^5^5^6 2^3^2^3^2^3^3 1^1^1^1^2^1^1^3 (x ➖ 3x+2) 23/1=1 25/1 =25:{23+25}=48 23^25 1^3^1^2^3 1^1^2^3 (x ➖ 3x+2) 26/2=13 28/2=14 {13+14}=27 13^14 3^4 3^1^2^2 3^1^1^2 32(x ➖ 3x+2) 29/1=29 31/1 =31 {29+31}=60 29^31 13^16^15^16 3^3^3^2^3^3^3 1^1^1^2^1^1^3 23(x ➖ 3x+2) 32/2=16 34/2=17 {16+17}=33 16^17 6^7 6^3^4 3^3^3^2^2 1^1^3^1^2 32(x ➖ 3x+2). Amazing content as always.