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2 years ago

PLA This is for my homwork. PLA help ME!

Mathematics

1 answer:

Mice21 [21]2 years ago

7 0

82/4+20-15
82:4=20.5
20.5+20=40.5
40.5-15=25.5

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A runner has run 2.281 kilometers of a 10 kilometer race. How much farther does he need to run to finish the race? Show your wor

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Answer:

7.719km

Step-by-step explanation:

10 - 2.281 is 7.719

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3 years ago

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Suppose a simple random sample of size nequals36 is obtained from a population with mu equals 74 and sigma equals 6. (a) Descri

OlgaM077 [116]

Part a)

The simple random sample of size n=36 is obtained from a population with

$\mu = 74$

and

$\sigma = 6$

The sampling distribution of the sample means has a mean that is equal to mean of the population the sample has been drawn from.

Therefore the sampling distribution has a mean of

$\mu = 74$

The standard error of the means becomes the standard deviation of the sampling distribution.

$\sigma_ { \bar X } = \frac{ \sigma}{ \sqrt{n} } \\ \sigma_ { \bar X } = \frac{ 6}{ \sqrt{36} } = 1$

Part b) We want to find

$P(\bar X \:>\:75.9)$

We need to convert to z-score.

$P(\bar X \:>\:75.9) = P(z \:>\: \frac{75.9 - 74}{1} ) \\ = P(z \:>\: \frac{75.9 - 74}{1} ) \\ = P(z \:>\: 1.9) \\ = 0.0287$

Part c)

We want to find

$P(\bar X \: < \:71.95)$

We convert to z-score and use the normal distribution table to find the corresponding area.

$P(\bar X \: < \:71.95) = P(z \: < \: \frac{71.9 5- 74}{1} ) \\ = P(z \: < \: \frac{71.9 5- 74}{1} ) \\ = P(z \: < \: - 2.05) \\ = 0.0202$

Part d)

We want to find :

$P(73\:$

We convert to z-scores and again use the standard normal distribution table.

$P( \frac{73 - 74}{1} \:< \: z$

5 0

2 years ago

Do any of y'all know how to do this I'm so confused and I need help plz show ur work btw

uranmaximum [27]

Answer:

I don't know the answer to the first one, but the second one's answer is 8.625

Step-by-step explanation:

1.5*2.5 + 1.5*2.5 + (1.5*1/5)/2 = 3.75 + 3.75 + 2.25/2 =

7.5 + 1.125 = 8.625

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2 years ago

Martha has three rows of flowers. There were n flowers in each row. How many total flowers were in each row?

Akimi4 [234]

There were “3n” total flowers in each row.

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2 years ago

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In a right triangle the shortest rib is 4cm and the largest 8 cm .Find the perimetre

Marizza181 [45]

Answer:

24 cm

Step-by-step explanation:

(4+4) + (8+8)

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2 years ago