Read the following passage and answer the questions below:
New Delhi : A few districts in the eight empowered action group (EAG) states have excelled by achieving the targets set by the United Nations under the millennium development goals (MDGs). The EAG states are Madhya Pradesh, Chhattisgarh, Uttar Pradesh, Uttarakhand, Bihar, Jharkhand, Orissa and Rajasthan.
Of the 248 districts of the EAG states and Assam categorized as having the worst health indicators – six have reduced the infant mortality rate (IMR) to 28. The MDG target is to bring down the IMR – the number of infant deaths per 1,000 live births – to 28 by 2015. The districts are Purbi Singhbhum and Dhanbad (Jharkhand); Chamoli, Rudraprayag, Pithoragarh and Almora (Uttarakhand).
Bokaro and Ranchi (Jharkhand), Bageshwar and Nainital (Uttarakhand) are also close to achieving the goals but sadly enough, female infants in these districts experience a higher mortality than male infants and mortality in rural areas is worse than those in urban centres. The survey also reveals that the smaller States carved out of the bigger ones in the recent past have performed better.

What is infant mortality rate? Name the districts which have reduced their IMR to 28.