How to pronounce the sign of average

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9. 6 = 100 add operation symbol
10. Fill in the sign between 12345678 to make the formula equal to 51 I'm in a hurry. I said to Hua
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15. What is the relationship between mean and standard deviation?
16. Who can help me calculate the mean ± SD Group 1: age: 21,22,27,28,16,16,15,16,15,15,16,16,17,17,12,10,16,4,15,19,16,61,4,14,14,9,5,2,9,4,55,14,38,11,3,3,10,32,22,22,33,23,27,21,15,5,38,37,6,22,31,35,52,25,14,20,17,14,14,16,52,5,35,16,32,28,15 The second group: days: 10,9,2,7,9,9,9,10,6,10,5,9,8,7,5,6,4,5,7,10,6,4,4,6,5,12,10,4,10,5,4,3,4,3,7,5,5,6,9,6,5,4,7,13,3,12,5,7,4,5,7,6,8,9,6 The third group: days: 51 cases, the incubation period, the first day 27, the second day 10, the third day 6, the fourth day 7, the fifth day 1, the average incubation period of how many days? Group 4: days, 65 samples, 1 case turned negative on the first day, 7 on the second day, 30 on the third day, 17 on the fourth day, 6 on the fifth day, 4 on the sixth day, how many days turned negative on average
17. How to read? What symbols? It's like an eight
18. How to read the sign of standard deviation is not Sigma in the quantitative method,
19. We have already calculated the standard deviation of mean addition and subtraction. How can we compare it with the national norm in SPSS and calculate t
20. I have a group of data of mean plus minus standard deviation. I want to compare between groups and calculate p value. Who can tell me how to do it with SPSS software? Must statistics software how to do ah, because I have several groups, have to calculate ah Group quantity data C 12 0.983+0.062 M 12 0.735+0.059 HD 12 0.927+0.084 MD 12 0.911+0.065 LD 12 0.916+0.045 X 12 0.937+0.038