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3 years ago

Help me with my unit test please!

Mathematics

1 answer:

Usimov [2.4K]3 years ago

3 0

Answer:

they are equal

Step-by-step explanation:

1/4 is equal to the absolute value of -1/4

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3 absolute value of 2x plus 5 equals 15. what's the answer

slega [8]

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3 years ago

PLSSS HELP ASAP!!!!!!!

natali 33 [55]

I would say rectangular correct me if I’m incorrect :)

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3 years ago

Find the minimum sample size necessary to be 99% confident that the population mean is within 3 units of the sample mean given t

olga55 [171]

Answer:

623

Step-by-step explanation:

Given that margin of error (E) = 3 unit, standard deviation (σ) = 29, sample size (n) = ?

a) The confidence (C) = 99% = 0.99

α = 1 - C = 1 - 0.99 = 0.01

α/2 = 0.01 / 2 = 0.005

From the normal distribution table, The z score of α/2 (0.005) is the critical value and it corresponds to the z score 0.495 (0.5 - 0.005) which is 2.58.

$critical\ value = z_{\frac{\alpha}{2} }=z_{0.005}=2.58\\$

b) The margin of error (E) is given as:

<h3> $E=z_{\frac{\alpha}{2} }*\frac{\sigma}{\sqrt{n} }\\\\\sqrt{n}= z_{\frac{\alpha}{2} }*\frac{\sigma}{E }\\ \\n=( z_{\frac{\alpha}{2} }*\frac{\sigma}{E })^2\\\\Substituting:\\\\n=(2.58*\frac{29}{3} )^2=622.0036\\\\\\n=623(to\ the \ next\ whole\ number)$ </h3>

The minimum sample size (n) is 623

3 0

4 years ago

if a single card is drawn from a standard 52 card deck what is the probability that it is neither a jack nor a club

Westkost [7]

Answer:

9/13

Step-by-step explanation:

There are 13 clubs in a pack and another 3 jacks, a total of 16 cards.. Thus the number of cards which are not belonging to this group is 52-16 = 36.

The required probability is therefore 36/52

= 9/13 (answer)

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4 years ago

Is 0.7÷10 equal to 0.07

Vlada [557]

Yes, it is 0.7/10=0.07

6 0

3 years ago