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بنات ساعدوني في حل هالاسئله

. The average weight of books on a library f is 8.3 grams. The standard deviation
is 0.6 grams. If 20% of the books are oversized , find the minimum weight of the large books on the library f. Assume the variable is normally distributed. A) 8.612 grams
B) 0.3 gram C) 0.84 gram D) 8.804 grams

[/Find two z values so that 41.08% of the middle area is bounded by them A) ± 1.35
B) ± 0.4108 C) ± 0.54 D) ± 0.2054
The average repair cost of a microwave oven is $55, with astandard deviation of $8. The costs are normally distributed. If 12 ovens are repaired, find the probability that the mean of the oven repair will be greater than $60. A) 0.015
B) 0.4850 C) 0.2643 D) 0.985

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