Table:
text: 2008 IAAF World Indoor Championships – Women's 400 metres
Semifinals
Semifinals
Heat Lane Name_ Country Mark
1 5 Olesya Zykina Russia 51.75
1 3 Antonina Yefremova Ukraine 51.79 PB
1 6 Moushaumi Robinson United States 51.85 PB
1 1 Racheal Nachula Zambia 53.30 NR
1 2 Makelesi Batimala Fiji 54.23
1 4 Christy Ekpukhon Ihunaeqbo Nigeria DNS
2 6 Natalya Nazarova Russia 51.62
2 3 Shareese Woods United States 51.87 PB
2 4 Angela Morosanu Romania 52.83 SB
2 2 Zuzana Hejnová Czech Republic 53.16
2 5 Amantle Montsho Botswana 53.21
2 1 Nataliya Pyhyda Ukraine 53.33

Question: What is the lowest run for the United States with a grade of 51.85 Pb and a lane higher than 6 in the 2008 IAAF World Indoor Championships - Women's 400m Semifinals?

Question: What is the average lane of Racheal Nachula when the heat is less than 2 for the 2008 IAAF World Indoor Championships - Women's 400m Semifinals?

Question: What is the average run with 52.83 SB marks and less than 4 lanes for the 2008 IAAF World Indoor Championships - Women's 400m Semifinals?