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question: the quality control department of a company making computer chips knows that 2% of the chips arw defective. use the nurmal approximation to the binomial probability distribution, with a continuity correction, to find the probability that, in a batch containing 1000 chips, between 20 and 30 chips (inclusive) are defective.

my answer: probability=0.02

using TI 84+

binomcdf(1000,0.02,30)-binomcdf(1000,0.02,19)=0.5179 (its my answer)

but the textbook says the answer is: 0.5349

is there anything wrong with my solution? what do you think is the real answer?

thank you