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Hello,

I'm doing some work on PERT Analysis. In the example that I've been given it says to multiply the standard deviation by a value from the normal probability table, in the example given it states 1.96 will give 2.5% chance of going over.

Ive looked at the normal probability table and cannot see how the figure 1.96 or 2.5% is created?

http://209.85.229.132/search?q=cache:7Xz8ZLdXI_8J:www.stat.psu.edu/~babu/415/norm-tables.pdf+normal+probability+table&hl=en&ct=clnk&cd=1&gl=uk

Can anybody explain how the percentage figure is derived from the value?

Thanks.

I'm doing some work on PERT Analysis. In the example that I've been given it says to multiply the standard deviation by a value from the normal probability table, in the example given it states 1.96 will give 2.5% chance of going over.

Ive looked at the normal probability table and cannot see how the figure 1.96 or 2.5% is created?

http://209.85.229.132/search?q=cache:7Xz8ZLdXI_8J:www.stat.psu.edu/~babu/415/norm-tables.pdf+normal+probability+table&hl=en&ct=clnk&cd=1&gl=uk

Can anybody explain how the percentage figure is derived from the value?

Thanks.

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