how many Jews were killed per day the holocaust?

Of course it is possible to work out a daily figure, but this can be misleading. Routine gassings began on 8 December 1941 (at Chelmno) and the Holocaust lasted practically till the end of World War 2 in Europe. On that basis you would get a daily figure of about 4,600 killed per day.

However, there are slightly different ideas as to when the Holocaust began and a daily figure can be misleading. (For example, some would date the start from 25 June 1941, when the mobile killing units went on their first killing spree - in Kaunas, Lithuania). Moreover, some victims died of disease shortly after liberation. For example, nearly 14,000 victims at Bergen-Belsen died after the camp was liberated.

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All together about 3 million Jews were killed in the mass genocide known as the Holocaust.

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3 million? The usual figure is in the range of 5.7-6.2 million.