<span>2x2=4x2=8x2=16x2=32x2=64x2=128x5=640 which is 2*2*2*2*2*2*2*5</span>
Magnesium chloride (MgCl2)
Z score = 66 - 76
---------- = - 1
10
from the tables of normal distribution this corresponds to 0.34-3 of the area under the normal curve
so reuired number od students = 0.3413 * 230 = 78
C
because you would take 3/4 and multiply it by 3/3 to get the denominator to 12
and you would multiply 1/3 by 4/4 again to get the denominator to 12.
You are getting the denominator to 12 because 12 is 3 and 4s Most Common multiple!
Now that you have multiplied them you should have 9/12 and 4/12
Then you subtract 4 from 9 to get 5.
So the answer is 5/12!
