MCQ
If $ 7\text{x} + 3 < 5\text{x} + 9$ then$\text{x}\in$
- A$\big(-\infty, 3\big]$
- B$\big(\infty,\infty\big)$
- C$\big(-\infty,3\big)$
- D$\big[3,\infty\big)$
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The mean of 100 observations is 50 and their standard deviation is 5. The sum of all squares of all the observations is: