Mrs Jennings shares £770 between her two sons, Pete and Tim.
She shares the money in the ratio of her sons’ ages.
The combined age of her two sons is 66 years.
Pete is 6 years younger than Tim.
Work out how much money each son gets.
You must show all your working.

The fraction of defective integrated circuits produced in a photolithography process is being studied. a random sample of 300 circuits is tested, revealing 17 defectives. (a) calculate a 95% two-sided confidence interval on the fraction of defective circuits produced by this particular tool. round the answers to 4 decimal places. less-than-or-equal-to p less-than-or-equal-to (b) calculate a 95% upper confidence bound on the fraction of defective circuits. round the answer to 4 decimal places. p less-than-or-equal-to