The widths of belt buckles sold in a retail shop have a normal distribution. Over a period of time,

Question

The widths of belt buckles sold in a retail shop have a normal distribution. Over a period of time, it is found that $60$% of the belt buckles have width more than $25$ mm and $15$% of the belt buckles have width less than $24$ mm. Calculate the mean and variance of the distribution.[4]

Accepted Answer

mean = 25.3, variance =1.63

2024 RVHS H1 Q6

2024 RVHS H1 Q6