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Elina [12.6K]
3 years ago
10

What are the best tips to score more than 90% in the class 10 cbse board exams 2021-2022, I'm really nervous

Mathematics
1 answer:
Nataliya [291]3 years ago
7 0

Answer:

Take exam

Step-by-step explanation:

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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

4 0
2 years ago
What is 25 percent of thirty?<br> Give Step by step explanation.<br> please.
ohaa [14]
25% of 30 = 7.5
Hope this helps idk if it does tho
3 0
3 years ago
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What divided by 8 to equal 3
blsea [12.9K]

Answer:

Nothing

Step-by-step explanation:

You can't divide 8 to equal 3 because 3 is an odd number and 8 is an even number.

:)

5 0
2 years ago
Can someone help me please I would appreciate it.
Dmitry_Shevchenko [17]
The answer is c to my calculations.
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3 years ago
Simplify by dividing . 3 over 5 - -4 0ver 9 plz help
Basile [38]
1. -.6 or -3/5
2. -.4 or -4/9

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2 years ago
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