The mean of 100 items was found to be 30. If at the time of calculation, two items were wrongly taken as 32 and 12 instead of 23 and 11, the correct mean is:  

Guru Nanak founded the Kartarpur town by Ravi River in 1504, plowing the fields and setting up a community kitchen, or Langar. He assembled a Sikh commune there, and lived for 18 years until his death on 22 September 1539. The gurdwara is built where Guru Nanak is said to have died.