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jonny [76]
3 years ago
15

Tawiah is x years old now. a) How old was he 7 years ago? b) How old will he be in 15 years from now? c) If his age in 15 years

time will be three times his age 7 years ago, how old is he now?​ thanks
Mathematics
1 answer:
Brilliant_brown [7]3 years ago
6 0

i think x = 56 but im not 100% sure

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What is the standard deviation of this data set? Use a calculator to help you.
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Answer:

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Step-by-step explanation:

We are given the following data;

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       20                     20 - 46 = -26                    676

       23                     23 - 46 = - 23                    529

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       36                     36 - 46 = -10                      100

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       43                     43 - 46 = -3                          9

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       55                      55 - 46 = 9                        81

      59                       59 - 46 = 13                      169

       61                       61 - 46 = 15                       225

       63                       63 - 46 = 17                      289

       66                       66 - 46 = 20                <u>     400    </u>    

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                   s = \sqrt{\frac{ \sum(X-Xbar)^{2}}{n-1}} = \sqrt{\frac{ 2769}{15-1}} = 14.064 .

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