1. The problem statement, all variables and given/known data The resistances of 50 resistors are measured and the results recorded are as follows: Resistance x Frequency 1.) 5 x 17, 2.) 5.5 x 12, 3.) 6 x 10, 4.) 6.5 x 6, 5.) 7 x 5) Calculate standard deviation of the measurements 2. Relevant equations 3. The attempt at a solution Added up the frequences and got n = 50 Multiplied the resistance by its weight or frequency and got the following: 1.) 86 2.) 66 3.) 60 4.) 39 5.) 35 then I added the values up and divided the result by the sum of the frequencies (n) to get the mean (cant do an x bar so I'll denote it as M) M = 5.7 If I follow the standard deviation formula and add up all results of (x - m)2 I get a really low number so if I then divide that really low number by n which is 50 I get something like 0.0049. What am I doing wrong? Is the x of the formula resistance x frequency in this case since its weighted data Im dealing with?