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artcher [175]
3 years ago
9

How do you know if you are correct in math?

Mathematics
1 answer:
8_murik_8 [283]3 years ago
8 0

You can check your work by using a calculator or using another method to find the same answer to the same question. You could also ask a friend

Pleaze mark brainliest!!

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Step-by-step explanation:

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Can anyone help solve question3 the (ii) and the question2 match the following
Trava [24]

Answer:

2.

i) (c)

ii) (d)

iii) (b)

iv) (a)

3.

ii)  80°

Step-by-step explanation:

2.

i) 2x+x+3x=180°

x=30°

ii) x+110=180

x=70

iii) x+2x+30°=180

x=50°

iv) 2x+15°+45°+x=180

3x+60°=180

x=40°

3.

ii) 2x+5+25=180°

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3 0
3 years ago
Suppose a large shipment of compact discs contained 19% defectives. If a sample of size 343 is selected, what is the probability
Yuri [45]

Answer:

The value is  P( | \^p - p | <  0.04) = 0.9408

Step-by-step explanation:

From the question we are told that

    The population proportion is p =  0.19

   The sample size is n = 343

 Generally given that the ample size is large enough , i.e  n > 30 then the mean of this sampling distribution is mathematically represent

      \mu_{x} = p = 0.19

 Generally the standard deviation is mathematically represented as

      \sigma   =\sqrt{\frac{p(1- p)}{n} }

=>   \sigma   =\sqrt{\frac{0.19 (1- 0.19 )}{343 } }  

=>   \sigma   = 0.0212

Generally the the probability that the sample proportion will differ from the population proportion by less than 4% is mathematically represented as

        P( | \^p - p | <  0.04) = P( \frac{|\^ p - p |}{ \sigma_p } <  \frac{0.04}{0.0212 }  )

\frac{|\^ p - p |}{\sigma }  =  |Z| (The  \ standardized \  value\  of  \ |\^ p - p | )

     P( | \^p - p | <  0.04) = P( |Z| <  1.887   )

=>  P( | \^p - p | <  0.04) = P( Z <  1.887   )- P( Z <  -1.887   )

From the z table  the area under the normal curve to the left corresponding to  1.887  and  - 1.887  is

      P( Z <  1.887   )= 0.97042

and  

     P( Z <  -1.887   )= 0.02958

So

     P( | \^p - p | <  0.04) = 0.97042 - 0.02958

=>   P( | \^p - p | <  0.04) = 0.9408

3 0
3 years ago
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