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I am failing this course MISERABLY and cannot get through this test review

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Question

I am failing this course MISERABLY and cannot get through this test review to save my life.  Worse than that..

Once I get through that I have to take the actual test.  They are both already late and I am desperate. 

https://www.mathxl.com/Student/PlayerTest.aspx?testId=144058160&centerwin=yes
 
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why is the standard deviation zero

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Question

 if a data set has 50, 50,50,50,50 why is the standard deviation zero

 
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The mean height of women in a country (ages 20-29) is 64.2 inches

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Question

 The mean height of women in a country (ages 20-29) is 64.2 inches. A random sample of 60 women in this

age group is selected. What is the probability that the mean height of the sample is greater than 65 inches? Assume σ .56

 
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The mean height of women in a country (ages 20-29) is 64.1 inches

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Question

 The mean height of women in a country (ages 20-29) is 64.1 inches. A random sample of 55 women 
women in

this age group is selected. What is the probability that the mean height for the sample is greater than 65 inches? Assume σ=2.54

 
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