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A population has mean \mu = 50 and standard deviation \sigma = 10.
A random sample of size n = 100 is taken.
The standard deviation of the sampling distribution of the mean is:
heights of students in a school are normally distributed mean= 160 and standard deviation =8 If random sample of 25 students is selected, what is the probability that the sample mean is less than 158
يَحضُنُ الصديق القلب وقتَ انكساره
ويَمسَحُ الدمعَ إن ضاقت به الأيامُ
فاعل الفعل يحضن هوا
