please help me quick with this statistics question on standard deviation?

Question

If a set of data has 49 points and variance 36, then what is the standard deviation?
A) 4
B) 7
C) 6
D) 5

how did you get your answer if you get it. thanks for your help.

Answer 1

variance is the square of the sd

so the sd is sqrt(36) = 6

choice C

Answer 2

think a super number of scholars went into do an examination. The greater the greater useful. On a countrywide scale, if each and all the outcomes have been taken and plotted onto a graph, some scholars will do poorly, some will do ok and maximum people will lie in between the two extremes. by skill of human nature, the graph plotted would be a typical distribution graph, it fairly is going to look like a bell shape layout. the utmost component of the graph stands out as the advise, and at this component whilst a line is drawn down vertically to diminish the x-axis, it fairly is going to divide the graph in 2 equivalent areas. the style of shape is what's familiar as a typical distribution curve and that's symmetrical approximately it fairly is centre line which coincides with the advise (x bar) of the observations. the familiar deviation is a level of ways this wisdom is unfolded. One familiar deviation of the two sides of the advise (x bar ±?) will comprise sixty 8% of the documents. 2 familiar deviation of the two sides of the advise (x bar ±2?) will comprise ninety 5% of the documents. 3 familiar deviation of the two sides of the advise (x bar ±3?) will comprise ninety 9?7% of the documents. those values observe for a typical distribution. So the familiar distribution is a level of the unfold of documents from the advise.

Answer 3

I would guess 6, because when you count up by sixes you can get 36. You can't with the others. Good luck