4*979 = 4*980 = 4*(1000-20) = 4000 - 80 = 3920.
Exact answer = 3916
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7 x 4 = 28
Since the probability is 1/4, the number of times this will happen will likely be close to 68 divided by 4.
138
It is 0.441
Most people would estimate that as 6 (an overestimate) + 4 (an underestimate) which would estimate the answer as 10, which is an underestimate.