In a sack of mixed grass seeds, the probability that a seed is ryegrass is 0.35. Find

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In a sack of mixed grass seeds, the probability that a seed is ryegrass is 0.35. Find the probability that in a random sample of 400 seeds from the sack,

(a) less than 120 are ryegrass seeds,

(b) between 120 and 150 (inclusive) are ryegrass,

(c) more than 160 are ryegrass seeds.

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