normal dis with multiple items

Apr 2009
11
0
Question
height of one row = mean = 20.00cm
std dev = 0.25cm

if a wall has 10 rows (i.e. 10* 20cm = 200cm)
1) what is the distribution of the height?
2) find probability wall height is less than 199cm & greater than 201cm?

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how do you incorporate the 10 rows instead of just one?
 

mr fantastic

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