هنآ: اسئلتكم في مآدةة الاحصآء

[Eman A.Al Sh]

سؤال 1 ..

The average height of apple trees in a garden is 10,5 feets , if the heights are normally distributed with a standard deviation of 3 , find the percentage that a tree is less than 12,5 feets tall

???

الحل : 74,86%


سؤال 2 ..

The average of 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 (ذات حجم كبير ) , find the minimum weight of the large books on the library f , assume the variable is normally distributed

الحل : 8,804 grams

بليز ابغى اعرف كيف انحلت هالسؤالين ..