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3 years ago

15

Jenny has $2.40 deducted from her monthly allowance every time she forgets to do a chore. If she forgets three times in one mont

h, what will be the change in Jenny's total allowance?

1 answer:

Hunter-Best [27]3 years ago

7 0

Answer:

The difference would be $7.20

Step-by-step explanation:

Multiply $2.40 times 3

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3 years ago

Scores from an exam are normally distributed with a mean of 85 and a standard deviation of 5. Suppose 188 students take the exam

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The mean is $\mu=85$ and standard deviation is $\sigma=5$ . Then the variable $X\sim N(85,5)$ .

Use substitution $Z=\dfrac{X-\mu}{\sigma}=\dfrac{X-85}{5}$ , then the variable $Z\sim N(0,1)$ .

The probability $Pr(X>80)$ can be calculated in the following way:

for X=80, $Z=\dfrac{80-85}{5} =-1$ and $Pr(X>80)=Pr(Z>-1)$ . From the diagram $Pr(Z>-1)=0.34+0.34+0.135+0.025=0.84$ .

Conclusion: if 188 students take the exam, then 188·0.84=157.92 (157) would receive a score above 80

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4 years ago

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3 years ago

Zeus Industries bought a computer for $2859. It is expected to depreciate at a rate of 21% per year. What will the value of the

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4 years ago

A card is drawn from a well-shuffled deck of 52 cards. Find the probability of drawing a diamond or a spade.

AveGali [126]

Answer:

2/13

Step-by-step explanation:

For a deck of card

Total cards = 52

Total spade = 4

Total diamond = 4

pr(drawing a spade) = number of spade/total cards

pr(drawing a spade) = 4/52 = 1/13

pr(drawing a diamond) = 4/52 = 1/13

Pr(diamond or a spade) = 1/13 + 1/13 = 2/13

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3 years ago