Calculate the mean for samples for which the sample size and summation from nothing to nothing x∑x are given below. a. nequals=10, summation from nothing to nothing x∑xequals=8282 b. nequals=16, summation from nothing to nothing x∑xequals=336336

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.