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Most IQ scores are normally distributed with μ=105 and σ= 12. What is the probability that a...

Most IQ scores are normally distributed with μ=105 and σ= 12.

What is the probability that a random sample of 20 individuals has an IQ score:

1) less than 98?
2) between 100 and 105?
3) above 103?

(can someone please show me how to answer this...i keep mixing up my formulas ?)

Math   Statistics-And-Probability   
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