اسئله في الاحصاء :(

[rofa #]

السلام عليكم

لو سمحتوا عندي كم سوال في النماذج

find 2 z valua so 41.08% the middle area bounded by them

answer : 0.54

how many 3_digit bassword are possible if digits by repeated ?

answer: 1000!

averga weigt of b ook 8.3 g .s.d 0.6 g. if 20%of book are oversized find minimum weigt the larg book .assume the varible normal distributed?