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Sunny_sXe [5.5K]
3 years ago
12

THESE are PSAT questions please help.​

Mathematics
1 answer:
cricket20 [7]3 years ago
3 0

Answer:

Ok so number 7 is x>4

Number 6 is b

Number 5 is correct

Idk the other one

❤️❤️❤️Hope This Helps❤️❤️❤️

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devlian [24]

Answer:

F = 0

Step-by-step explanation:

F(x) = 2 - 2

fx/3 = 0/x

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3 years ago
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Calculate a critical z-score for a left-tailed, right-tailed, or two-tailed test.
muminat

Answer:

a. Z = -1.175.

b. Z = 1.34.

c. |Z| = 2.054.

d. |Z| = 1.28.

Step-by-step explanation:

Z-score:

In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

a. The critical z-score for a left-tailed test at a 12% significance level

Left-tailed test: The region of interest is the 12th percentile or below.

Thus, the critical z-score is Z with a p-value of 0.12, so Z = -1.175.

b. The critical z-score for a right-tailed test at a 9% significance level

Right-tailed test: The region of interest is the 100 - 9 = 91th percentile and above.

Thus, the critical z-score is Z with a p-value of 0.91, so Z = 1.34.

c. The critical z-score for a two-sided test at a 4% significance level is 1.75.

Two-tailed test: The region of interest is between the 4/2 = 2th percentile and the 100 - (4/2) = 98th percentile.

Thus, the critical z-score is |Z| with a p-value of 0.02 or 0.98, so |Z| = 2.054.

d. The critical z-score for a two-sided test at a 20% significance level is 0.85.

Region of interest is between the 20/2 = 10th percentile and the 100 - (20/2) = 90th percentile.

Thus, the critical z-score is |Z| with a p-value of 0.1 or 0.9, so |Z| = 1.28.

4 0
3 years ago
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kiruha [24]

Answer:

40

Step-by-step explanation:

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yulyashka [42]

Answer:

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Step-by-step explanation:

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If a person draws 2 cards at random from a standard deck of 52 cards, what is the probability that they get 2 aces?
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Step-by-step explanation:

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