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poizon [28]
3 years ago
10

A multiple choice test consists of 100 questions. A correct answer is worth 2 marks, while an incorrect answer is worth -1 marks

. If a student receives a score of 89, how many questions did this student answer in correctly
Mathematics
1 answer:
Papessa [141]3 years ago
5 0

Answer:the answer is 44.50

Step-by-step explanation:

since the right answer worth more than the wrong then you have to put 89 divide by 2 because two is how much point the correct answer worth.

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How do I find the domain of f(x)=5x^2+4. When 0&lt;=x&lt;=2<br><br> #54
Blizzard [7]

Hi

if 0 ≤ x ≤ 2

0^2\leq x^2\leq 2^2

Multiplied by 5..... 5×0^2 \leq 5x^2\leq 5×2^2

add 4  .........5×0^2+4 \leq 5x^2+4\leq 5×2^2+4

so ........4\leq 5x^2+4\leq 24



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3 years ago
What is mode median and range
nalin [4]
The median is the middle number, the range is the difference between the lowest and highest values(subtract the lowest number from the highest number) and the mode is the number that appears most often in a set of numbers
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7 0
3 years ago
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A quadratic equation that can be written as the difference of squares has...
quester [9]

Answer: C two solutions

Step-by-step explanation:  

The Difference of Two Squares theorem says that any time an equation may be written as a difference between squares A² - B² = 0 it may be rewritten as two products, the sum and difference of the square roots (A + B) (A - B)

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2 years ago
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Suppose that the weights of passengers on a flight to Greenland on Frigid Aire Lines are normal with mean 175 pounds and standar
Natali5045456 [20]

Answer:

The minimum weight for a passenger who outweighs at least 90% of the other passengers is 203.16 pounds

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore 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 pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 175, \sigma = 22

What is the minimum weight for a passenger who outweighs at least 90% of the other passengers?

90th percentile

The 90th percentile is X when Z has a pvalue of 0.9. So it is X when Z = 1.28. So

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

1.28 = \frac{X - 175}{22}

X - 175 = 22*1.28

X = 203.16

The minimum weight for a passenger who outweighs at least 90% of the other passengers is 203.16 pounds

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A study conducted an experiment with 22,000 women over 10 years to investigate whether a high-stress job leads to heart problems
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The sample of the group would be the 22,000 participants.
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