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3 years ago

A fast typist can type 120 words in 100 seconds. At that rate, how many seconds would it take to type 258 words?

Mathematics

1 answer:

Alexeev081 [22]3 years ago

5 0

Answer: 215 seconds

Step-by-step explanation:

This is a ratio problem so you can set up the ratio like this:

120 words : 100 second.

If you divide both sides of the ratio by 120 you get:

1 word: 0.8333 seconds

Multiply both sides of the ratio by 258 and you get:

258 words: 215 seconds.

Therefore typing 258 will take them 215 seconds.

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A student measured the lead content of a paint sample 4 times. The standard deviation of the measurements was found to be 0.76%

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Answer:

$CI =0.894%$

Step-by-step explanation:

From the question we are told that:

Sample size $n=4$

Standard deviation $\sigma=0.76\% of \=x$

Confidence level $\mu =90\%=0.90$

Degree of Freedom $Df=n-1=3$

Therefore

Test T from table is given

$t=2.353$

Generally the equation for Confidence interval CI is mathematically given by

$CI =t*\frac{\sigma}{\sqrt{n}}$

$CI =2.353*\frac{0.76}{\sqrt{4}}$

$CI =0.894%$

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