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g100num [7]
3 years ago
13

The grade-point average in an econometrics examination was normally distributed with a mean of 75. In a sample of 10 percent of

students it was found that the grade-point average was greater than 80. Can you tell what the s.d. of the grade-point average was?
Mathematics
1 answer:
never [62]3 years ago
3 0

To solve a standard deviation we require a specific result for each data. So this question(data from question) can not be enough to solve standard deviation.

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Free_Kalibri [48]
Well this depends on the the the size of the cover
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fomenos

Answer:

B

Step-by-step explanation:

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1) f(x)=(x - 3)(x - 5)
NemiM [27]

Answer:

Step-by-step explanation:

f(x)= (x - 3)(x - 5)

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7 0
3 years ago
Walden’s family is shopping for a reclining chair. The chair the family decided on has a retail price of $800 plus 5% sales tax
Marianna [84]

Answer:

B 10% off sale, with a total price to pay of 756

Step-by-step explanation:

Retail price (Rp) = $800

Taxes (T) = 5%

  • Offer A $75 instant rebate

Total price A (TA) = Rp - 75 + (Rp - 75) 5%

TA = 800 - 75 + (800-75) 5%

TA = 725 + 725 5%

725 5% = 725*5/100 = 36.25

TA= 725+36.25 = $761.25

  • Offer B 10% off sale

Total price B (TB) = RP - RP 10% + (RP - RP 10%) 5%

TB = 800 - 800 10% + (800 - 800 10%) 5%

800 10% = 800*10/100 = 80

TB = 800 - 80 + (800 - 80) 5%

TB = 720 + 720 5%

720 5% = 720*5/100 = 36

TB = 720 + 36 = $756

  • Offer C 5% off sale plus store pays sales tax

store pays sales tax means Walden's family will not need pay for taxes

Total price C (TC) = RP - RP 5%

TC = 800 - 800 5%

800 5% = 800*5/100 = 40

TC = 800 - 40 = $760

  • Offer D a “no tax” sale—the store pays the tax

Means that Walden's family will need pay just the retail price

TD = $800

The beast deal is from the store B

7 0
3 years ago
Read 2 more answers
PLEASE GIVE ME ANSWERS
matrenka [14]
They are all eawualateral
7 0
3 years ago
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