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3 years ago

A jet flies 405 miles in 5 hours. At this rate. how far could the jet fly in 15 hours? PLS

Mathematics

1 answer:

Marizza181 [45]3 years ago

3 0

Answer: 1215 miles

Step-by-step explanation:

405 miles in 5 hours is 81 mph so you multiply that mph by the amount of hours you want (15) so 81 x 15 = 1215

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3 years ago

A random sample of 78 eighth grade students' scores on a national mathematics assessment test has a mean score of 284.

oksian1 [2.3K]

Answer:

a) In the step-by-step-explanation

b) z(s) = -2.46 corresponding area is 0.0069

P [ μ₀ > 275 ] is 0.0069 or 0.69 %

We reject H₀

Step-by-step explanation:

Normal distribution

Random sample

size sample 78 = n

population standard deviation σ = 32

The school administrator declare that mean score is more (bigger than)

275. So the hypothesis test should be:

H₀ null hypothesis μ₀ > 275 and

Hₐ alternative hypothesis μ₀ < 275

Is one tail test with α = 0,04 from tables we have z(c) = - 176

We proceed to compute z(s)

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