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nata0808 [166]
3 years ago
15

The lengths of pregnancies are normally distributed with a mean of 264 days and a standard deviation of 15 days. if 36 women are

randomly selected, find the probability that they have a mean pregnancy between 264 days and 266 days.
Mathematics
1 answer:
Nitella [24]3 years ago
5 0
Given that a sample of 36 women is selected, the probability that the mean is between 264 days and 266 days will be found as follows:
the std deviation of the sample will be:
σ/√n
plugging the values we obtain:
15/√36
=15/6
=2.5
hence the z-score when x=264 will be:
z=(264-264)/2.5
z=0
thus:
P(x<264)=P(z<0)=0.5

the z-score when x=266 will be:
z=(266-264)/2.5
z=0.8
hence
P(x<266)=P(z<0.8)=0.7881
thus
P(264<x<266)=P(0.5<z<0.7881)
=0.7881-0.5
=0.2881

Answer: 0.2881
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Answer:

Step-by-step explanation:

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Step-by-step explanation:

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<h2>I HOPE THAT THIS ANSWER HELPS YOU</h2>
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Answer:

118 locations.

Step-by-step explanation:

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3 0
3 years ago
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Ne4ueva [31]
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</span>remember that<span>: 
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so

[ (x+6)(x-6) / 36x² ] / [ (x + 6) / 6x ] 


[ (x+6)(x-6) / 36x² ] * [ 6x / (x + 6) ] 


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</span>
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Hello!

The answer is 34°

Hope this helps!
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