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Sidana [21]
3 years ago
15

Find the unit rate Lisa walked 48 blocks in 3 hours how many blocks per hour

Mathematics
1 answer:
Kisachek [45]3 years ago
4 0
16 blocks in a hour
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1. The mean annual US household income is $72,641. Suppose that the standard deviation is $30,000. a. Find the probability that
valina [46]

Answer:

The answer is below

Step-by-step explanation:

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

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

Given that μ = $72,641 and σ = $30,000.

a) x > $100000

z=\frac{100000-72641}{30000}=0.91

P(x > 100000) = P(z > 0.91) = 1 - 0.8186 = 0.1814

b) n = 5

x > $100000

z=\frac{100000-72641}{30000/\sqrt{5} }=2.04

P(x > 100000) = P(z > 2.04) = 1 - 0.9793 = 0.0207

c) n = 10

x > $100000

z=\frac{100000-72641}{30000/\sqrt{10} }=2.88

P(x > 100000) = P(z > 2.88) = 1 - 0.9980 = 0.002

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3 years ago
Find the area of rectangle $BCEF$ . Round the area to the nearest whole number, if necessary.
WINSTONCH [101]

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999

Step-by-step explanation:

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I think that the answer is A

Step-by-step explanation:

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Each side of a square plastic tarp is 9 meters long. what is the tarps perimeter
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36

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Round 45.967 to the nearest tenth
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