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andrezito [222]

2 years ago

11

An exam consists of 10 true-or-false questions. If a student guesses at every answer, what is the probability that he or she wil

l answer exactly 6 questions correctly?

1 answer:

Bond [772]2 years ago

5 0

1/2 x 1/2 x 1/2 x 1/2 x 1/2 x 1/2 = 1/64.

I think there is is 1/64 chance.

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Consider the following hypothesis test: H 0: 20 H a: < 20 A sample of 50 provided a sample mean of 19.4. The population stand

goblinko [34]

Answer: p-value is 0.016.

Step-by-step explanation:

Since we have given that

$H_0:\mu=20\\\\H_a:\mu$

Sample mean = 19.4

Sample size n = 50

Standard deviation = 2

We need to find the test statistic value which is given by

$z=\dfrac{\bar{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}\\\\\\z=\dfrac{19.4-20}{\dfrac{2}{\sqrt{50}}}\\\\\\z=\dfrac{-0.6}{0.28}\\\\z=-2.14$

p-value is given by

$P(Z>Z_{critical})\\\\=P(Z>-2.14)\\\\=0.016$

Hence, p-value is 0.016.

8 0

2 years ago

At the beginning of 2012 Jacob's saving account had $675.20. He deposited $40 each month and earned $66.50 interest for the year

meriva

Not sure but i think it’s B

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3 years ago

These two polygons are similar.

Nady [450]

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yea........ hi how you doinn

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2 years ago

Abdul rolls a fair six-sided die and a fair four-sided die simultaneously. The sample space of all possible

gregori [183]

Answer: 7/24

Step-by-step explanation:

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The probability that the six-sided die is three or Abdul rolls doubles is 7/24. The calculation is attached.

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3 years ago

What is the sum of the measures of the interior angles of a 14-gon?

tensa zangetsu [6.8K]

The answer would be 154.3

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2 years ago

Read 2 more answers