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A 100-watt light bulb has an average brightness of 1640 lumens, with a standard deviation of...

A 100-watt light bulb has an average brightness of 1640 lumens, with a standard deviation of 62 lumens. Suppose that the brightness of bulbs follows normal distribution, then

(2). In a lot of 10000 such bulbs, what would be the number of bulbs to have the brightness more than 1800 lumens.

(3). What is the probability that a 100-watt bulb will have the brightness less than 1550 lumens?

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