Who is elligible for a givernment bursary teaching

Generous, tax-free funding is available to the best graduates training in a range of subjects. You could get a £26,000 bursary or be awarded a prestigious scholarship – which provides additional support and benefits throughout your training year. If you teach maths, you could get £30,000 – a £20,000 tax-free bursary while you train and a further £10,000 after tax once in teaching. With or without a bursary or scholarship, you could receive a tuition fee loan and maintenance loan to help fund your teacher training year. Alternatively, you could earn a salary while you train. 

You can use the student finance calculator to estimate student loans and extra funding that may be available, for instance Parents’ Learning Allowance, Childcare Grants or Child Tax Credits. If you’re on a salaried course, you can estimate any in-work benefits by using the calculators on GOV.UK. The calculator is for trainees intending to train in 2017/18 – you can still use this to get an estimate of your entitlement for 2018/19. An updated version will be released soon.

the answer is "by providing data about careers and annual mean wages"