Why not look up "standard deviation" yourself, to be sure? But yes, the std. dev. is the sqrt of the variance.
To solve this...
Look at the number and determine how far it is from 3,000 and 4,000
Since 424 is closer to 0
And not 500... (which rounds up)
Your answer is going to be 3,000
Hope this was helpful.
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25 will go into 33 once, with a remainder of eight.