I was wondering if anyone can help me with this problem, the question is written first and my problem is stated below it.

an investor has£1300, to invest in a portfolio of three shares

shares1 2and3yieldexpected returns of £7/15 , £2/25 , £1/25respectively to each pound inested, withvarianes £3/50 , £9/100 , £11/100respectively

i am also given the covariances - (i dont have the symbol for the variance sign so i will just useq, which are

q12 = 7/250

q13 = 7/500

q23 = -1/125

also a return ofatleast 7%of theavaiable budgetis required at min risk, where risk is measured by the variance of the return.

i need to minimize the problem to find the amount that should be invested in each share if the investors whole budget is to be spent.

The problem i am having with this question is the variance. In lectures iv been given examples with out them mentioning the the variance values.

I was wondering how to solve the problem with the variances £3/50 , £9/100 , £11/100 . do i need to manipulate my working out to include the variance?