When u add it stays the same but for subtraction u change the sign.
Example: 2- (-5)=7
B
The question says only in group Y so in total 79 people had a probability. The question states at least 1 dream so it can be anywhere between 1 and infinity but they have to had a dream with in the week.
You need to find simple values close to the actual ones asked.
sr(16) = 4 so -sr(17) is slightly below than -4
cr(8) = 2 because 2x2x2=8 so cr(9) is slightly above 2
cr(1) = 1 and cr(8) = 2 so cr(4) is between 1 and 2
Try the others yourself.
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