0+9=9
1*9=9
0 plus any number equals that number. 1 multiplied by any number equals that number
Answer:
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Answer:
For the first one the answer is 60 idk about the 2 one tho
Step-by-step explanation:
Answer:


Step-by-step explanation:
For this case we have the following data given:
2.3 3.1 2.8
1.7 0.9 4.0
2.1 1.2 3.6
0.2 2.4 3.2
Since the data are assumedn normally distributed we can find the standard deviation with the following formula:

And we need to find the mean first with the following formula:

And replacing we got:

And then we can calculate the deviation and we got:
