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3 years ago

In a scale drawing, the width of a sofa is 15 cm. The actual width of the sofa is 150 cm. What is the scale of drawing?

Mathematics

2 answers:

melisa1 [442]3 years ago

6 0

Answer:

10 is the scale drawing.

Step-by-step explanation:

sesenic [268]3 years ago

4 0

Answer:

1 cm : 10 cm

Step-by-step explanation:

If you put this into fraction form (15/150) and divide the numerator and denominator by 15, you will get 1/10. This means that for every 1cm on the paper, the couch is actually 10cm long (in that place) in real life.

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Solution to the problem

We know that n = 50 and p =0.78.

We need to check the conditions in order to use the normal approximation.

$np=50*0.78=39 \geq 10$

$n(1-p)=50*(1-0.78)=11 \geq 10$

Since both conditions are satisfied we can use the normal approximation and the distribution for the proportion is given by:

$p \sim N (p, \sqrt{\frac{p(1-p)}{n}})$

With the following parameters:

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