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3 years ago

Which of the following best describes why ddt is classified as a persistent organic pollutant.

SAT

1 answer:

Ostrovityanka [42]3 years ago

5 0

The reasons why DDT is classified as a persistent organic pollutant are;

DDT can be used to control diseases, such as malaria and typhus, that are spread by insects.

DDT is detected in food worldwide and the general human population is most commonly exposed to the toxin through food.

Persistent Organic Pollutants can be regarded as toxic substances which are made up of organic chemical compounds.

These are industrial chemicals such as;

PCBs

pesticides like DDT.

DDT is classified as a persistent organic pollutant because of it's usefulness in control diseases and it is been found in food stuff across the globe.

Learn more about DDT at;

brainly.com/question/14154063

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At a large corporation, the distribution of years of employment for the employees has mean 20.6 years and standard deviation 5.3

Cerrena [4.2K]

Answer:

Yes

Explanation:

The z score is a score used in statistics to determine by how many standard deviations the raw score is above or below the mean. The z score is given by:

$z=\frac{x-\mu}{\sigma}\\\\where\ \mu=mean.\sigma=standard\ deviation, x=raw\ score.\\\\For\ a \ sample\ size\ n:\\\\z=\frac{x-\mu}{\sigma/\sqrt{n} }$

For a normal distribution with a mean of μ and standard deviation σ, For any sample size (n) drawn from this population, the sample mean is normally distributed, with mean $\mu_x=\mu$ and standard deviation $\sigma_x=\frac{\sigma}{\sqrt{n } } \\\\$ .

Hence given that a mean of μ = 20.6 years and standard deviation σ = 5.3 years, for a sample size of 100:

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