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According to Global Research News (Mar. 4, 2014), one-fourth of all rough diamonds produced in the...

According to Global Research News (Mar. 4, 2014), one-fourth of all rough diamonds produced in the world are blood diamonds, i.e., diamonds mined to finance war or an insurgency. In a random sample of 1,000 rough diamonds purchased by a diamond buyer, let x be the number that are blood diamonds.

Find the approximate probability that the number of the 1,000 rough diamonds that are blood diamonds is less than or equal to 280.

I have no idea how to find that can someone explain.

mean=250

std=13.69

zscore=2.19

Math   Statistics-And-Probability   
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