The factors of 24 are 1,2,3,4,6,8,12, and 24. The factors of 40 are 1,2,4,5,8,10,20, and 40. The factors of 56 are 1,2,4,7,8,14,28, and 56. 24÷8=3. 40÷8=5. 56÷8=7. Therefore, the GCF of 24,40, and 56 is 
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First, we need to standardize the value 1440 and 1465 to be able to work out the z-score
The z-scores are shown in the diagram below
To work out the probability of
we can first read on the table, the probability when 
, then we subtract this value from 1, as we are interested in the area to the right of 1.77.
Then the area between and is 
which is also the probability of lifespan between 1440 and 1465
The z-scores are shown in the diagram below
To work out the probability of
Then the area between