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Fiesta28 [93]
3 years ago
15

Jack's last six scores are 75,78,83,80,79,84. If he scores a 90 on the next test, by how much will his mean test score increase?

Round to the nearest hundred.
Mathematics
1 answer:
kondaur [170]3 years ago
8 0

Answer:

1.46

Step-by-step explanation:

First find the the mean score before he made a 90.

\frac{75+78+83+80+79+84}{6} = 79.83

Now add the score of 90 and calculate.

\frac{75+78+83+80+79+84+ 90}{7} = 81.29

Subtract the two scores.

81.29-79.83 = 1.46

His mean test score increased by 1.46.

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Answer:

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Step-by-step explanation:

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(b). At least one face up is red.

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Following the same logic as in the previous item, the probability that exactly two dice turn up red is:

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The probability that all die turn up red is:

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Thus, the probability that at least one die turns up red is:

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