Normal distribution - statistics
The thickness of some plastic shelving produced by a factory is normally distributed. As part of the production process the shelving is tested with two gauges. The first gauge is 7mm thick and 98.61% of the shelving passes through this gauge. The second gauge is 5.2mm thick and only 10.2% of the shelves pass through this gauge.
Find the mean and standard deviation of the thickness of the shelving
I have created simultaneous equations and made one equal 2.20 and the other 2.30
Any help would be much appreciated as i am really stuck on this one
Thankyou very much