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satela [25.4K]
3 years ago
5

Solve for n. n+4+10=25

Mathematics
2 answers:
djyliett [7]3 years ago
7 0
N=11 because first you add the pairs like 4+10 which equal 14 then subtract that from the other side 14-25=11 which leaves you with n=11 if you follow what i am saying.
nexus9112 [7]3 years ago
6 0
N+4+10=25
n+4= 15
n=11
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The  condition  are

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           The  Alternative hypothesis is  H_a  :  \mu <  5

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Step-by-step explanation:

From the question we are told that

     The  population mean is  \mu =  5 \ year

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      The sample mean is  \=  x  =  4.6 \  years

       The  standard deviation is \sigma  =  2.2  \ years

   The  Null hypothesis is  H_o  :  \mu = 5

   The  Alternative hypothesis is  H_a  :  \mu <  5

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Generally the test statistics is mathematically evaluated as

                 t =  \frac{\= x  - \mu}{ \frac{\sigma }{\sqrt{n} } }

substituting values

                 t =  \frac{ 4.6  - 5}{ \frac{2.2}{\sqrt{20} } }

                t =  -0.8131

Looking at the value of  t and Z_{\alpha } we see that  t <  Z_{\alpha } so we fail to reject the null hypothesis  

  This implies that there is sufficient evidence to support the claim that in a small city renowned for its music school, the average child takes at least 5 years of piano lessons.

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