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lakkis [162]
3 years ago
15

The mean monthly utility bill for a sample of households in a city is $70, with a standard deviation of $8. Between what two val

ues do about 95% of the data lie? (Assume the data set has a Bell-shaped distribution.)
Mathematics
1 answer:
ddd [48]3 years ago
7 0
Empirical rule dictates that, in a Bell-shaped distribution, 95% of data lies within 2 standard deviation on either side of the mean.

Therefore,
Lower value = mean-2SD = 70-2*8 = 70-16 = 54
Upper value = mean+2SD = 70+2*8 = 70+16 = 86

Then, 95% of the data lies between $54 and 84. These values can also be taken as the true mean of the population considering 95% confidence when sample mean has been calculated. In this regard, 2SD can be regarded as the margin error.
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Please Help
xxMikexx [17]

Answer:

degree of length = 1

degree of width = 1

degree of height = 3

degree of volume = 4

Step-by-step explanation:

V = (4x - 1)( x)(x³) = (4x² - x)x³ = 4x∧5 - x∧4

dV/dx = 20x∧4 - 4x³  

d²V/dx² = 80x³ - 12x²

80x³ - 12x² = 0

4x²(20x - 3) = 0

20x - 3 = 0

20x = 3

∴ x = 3/20

Length, 4x - 1 = 4 (3/20) - 1 = 3/5 - 1 = -2/5

∴ degree of length = 1

Width, x = 3/20

∴ degree of width = 1

Height, x³ = (3/20)³ = 27/8000

∴ degree of height = 3

Volume, 4x∧5 - x∧4 = 4(3/20)∧5 - (3/20)∧4 = 4(243/3200000) - (81/160000) = 243/800000 - 81/160000 = (243 - 405)/800000 =               - 162/800000 = - 81/400000

∴ degree of volume = 4

5 0
3 years ago
Read 2 more answers
At a local hospital, 35 babies were born. if 23,were boys, what percentage of the newborns were boys?
Vesnalui [34]
So the fraction would be 23/35 are boys. If you do the division (23 ÷ 35) the answer is around 0.657.

That converted into a percentage (×100) is 65.7%
5 0
4 years ago
Find the IQR for the data set 24, 36, 42, 57, 65
Zielflug [23.3K]

Answer:

31

Step-by-step explanation:

The median of this data set is 42.

The 1st quadrant is the mean of 24 and 36:  30.

The 3rd quadrant is the mean of 57 and 65, or 61.

Thus, the IQR is the difference between 61 and 30:  It is 31.

3 0
3 years ago
Read 2 more answers
ANSWER ASAP PLEASE TY
kkurt [141]

Answer:

your pfp please ✋✋✋

5 0
3 years ago
When fireworks display made of copper is burned, it lets out light with wavelengths, v v, that satisfy the relationship | v − 45
Xelga [282]

Answer:

See attached picture.

Step-by-step explanation:

See attached picture for detailed explanation.

5 0
3 years ago
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