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Gre4nikov [31]
2 years ago
5

Suppose that the times it takes adult women to run a mile are normally distributed with an unknown mean and standard deviation.

The mile times of 29 randomly sampled adult women are used to estimate the mean of the population. Use Excel to calculate the t-score that should be used to find the 95% confidence interval for the population mean.
Round your answer to three decimal places.
Mathematics
1 answer:
Inga [223]2 years ago
8 0

Answer:

Step-by-step explanation:

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During a manufacturing process, a metal part in a machine is exposed to varying temperature conditions. The manufacturer of the
mars1129 [50]

Answer:

Yes, it will reach or exceed 141 degree F

Step-by-step explanation:

Given equation that shows the temperature T in degrees Fahrenheit x minutes after the machine is put into operation is,

T = 0.005x^2 + 0.45x + 125

Suppose T = 141°F,

\implies 141 = 0.005x^2 + 0.45x + 125

\implies 0.005x^2 + 0.45x + 125 - 141 =0

\implies 0.005x^2 + 0.45x - 16=0

Since, a quadratic equation ax^2 + bx + c =0 has,

Real roots,

If Discriminant, D = b^2 - 4ac \geq 0

Imaginary roots,

If D < 0,

Since, 0.45^2 - 4\times 0.005\times -16 = 0.2025 + 32 > 0

Thus, roots of -0.005x² + 0.45x + 125 are real.

Hence, the temperature can reach or exceed 141 degree F.

6 0
3 years ago
What does (-3+ -2+ 5)2 equal to
Alina [70]
-3 + -2 = -5

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Tina has 1/2 of a pan of cornbread left from a dinner party she eats 1/2 of the leftover part the next night how much of the who
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tina eats 1/4 of the pan

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Andrews [41]

Answer option D

Step-by-step explanation:

4 0
3 years ago
Calculate the perimeter and area for the parallelogram if a = 2.8 ,b = 16.5 and h = 11.5
Nana76 [90]

Perimeter = 2(a+b)

= 2(2.8+16.5)

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Perimeter = 38.6

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3 years ago
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