a) Figure 2 shows the number of people diagnosed with sexually transmitted infections (STIs) in the UK during 2017. sexually transmitted infection (STI) number of people diagnosed per 1000 of the population chlamydia 3.7 gonorrhoea 0.8 genital herpes 0.6 genital warts syphilis 1.1 0.1 Figure 2 (i) State the sexually transmitted infection that has the median number of people diagnosed.