The masses, in kilograms, of giant Botswana cabbages have a normal distribution with mean and standard

The masses, in kilograms, of ‘giant Botswana cabbages’ have a normal distribution with mean μ and standard deviation 0.75. It is given that 35.2% of the cabbages have a mass of less than 3kg. Find the value of μ and the percentage of cabbages with masses of less than 3.5kg.