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jolli1 [7]
3 years ago
14

The internet was used by 30% of the population of a state in 2008. If 3200 people were surveyed, how many in the survey were usi

ng the internet in 2008?
Mathematics
1 answer:
andrew-mc [135]3 years ago
4 0
1. We know that 30% expressed as a decimal is 0.30

Since 30% of people were using the internet, 0.30*3200 is our answer.
3200*0.30= 960.

Therefore 960 people were using the internet out of the 3200 surveyed.

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The designed life should be of 21,840 vehicle miles.

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Normal Probability Distribution

Problems of normal distributions can be solved using the z-score formula.

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Z = \frac{X - \mu}{\sigma}

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The designed life should be the 100 - 97 = 3rd percentile(we want only 3% of the vehicles to fail within this time), which is X when Z has a p-value of 0.03, so X when Z = -1.88.

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