probability

Find the area under the standard normal curve between:

(i) z1 5 21 and z2 5 1

(ii) z3 5 0 and z4 5 2

(b) The number of monthly ‘hits’ to a travel agency’s website is normally distributed with a mean of 10,000 and a standard deviation of 2,500.

Find the probability that the website will receive between 7,500 and 11,000 hits in any given month.

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