+0

# the incubation time for rhode island red chicks is normally distributed with mean of 30 days and standard deviation of approximately 2 days.

0
1159
2

the incubation time for rhode island red chicks is normally distributed with mean of 30 days and standard deviation of approximately 2 days. if 1000 eggs are being incubated, how many chicks do we expect will hatch in 24 to 26 days?

Guest Mar 5, 2015

#2
+92256
+5

Here is a pic

Here the probability is calculated to be 2.14 %.  It would be a little more accurate than my 2.35%

Using this percentage  the answer would be 0.0214*1000=21.4 = 21 chicks

Melody  Mar 5, 2015
Sort:

#1
+92256
+5

30-3*2=24 so    24 is 3 standard deviations below the mean

30-3*3-26  so     26 is 2 standard deviations below the mean

Prob  of being in this area is approx  (99.7-95)/2 percent

$${\frac{\left({\mathtt{99.7}}{\mathtt{\,-\,}}{\mathtt{95}}\right)}{{\mathtt{2}}}} = {\frac{{\mathtt{47}}}{{\mathtt{20}}}} = {\mathtt{2.35}}$$     percent

$${\frac{{\mathtt{2.35}}}{{\mathtt{100}}}}{\mathtt{\,\times\,}}{\mathtt{1\,000}} = {\frac{{\mathtt{47}}}{{\mathtt{2}}}} = {\mathtt{23.5}}$$

23.5 chick.   I suppose I should round that to approx   24 chicks.   :)

Melody  Mar 5, 2015
#2
+92256
+5

Here is a pic

Here the probability is calculated to be 2.14 %.  It would be a little more accurate than my 2.35%

Using this percentage  the answer would be 0.0214*1000=21.4 = 21 chicks

Melody  Mar 5, 2015

### 5 Online Users

We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details