### Statistics - Probability Distribution and Mean Determination

Incubated time for black chicks is distributed with a mean of 21days and standard deviation of 1 day.using what is given, If 1000 eggs are being incubated how many chicks do we expect to hatch a) in 19-23 days, in 20 to 22 dayd b) in 21 days or fewer d) in 18 to 24 days assuming all eggs hatched. This is what is given:u-3(me