Mathematics, 10.01.2020 02:31 imello51

Quality control is an important issue at acme company which manufactures light bulbs. in order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6).
378, 361, 350, 375, 200, 391, 375, 368, 321

4. what is the range?
a. 342.43
b. 3424.3
c. 58.5
d. 191
e. 1060

5. what is the variance?
a. 342.43
b. 3424.3
c. 58.5
d. 191
e. 10609

6. what is the standard deviation?
a. 342.43
b. 3424.3
c. 58.5
d. 191
e. 10609

Answers: 1

Show answers

Answers

Answer from: sweetcandy16gaming

4. D. 191

5. B. 3424.3

6. C. 58.5

Step-by-step explanation:

Given : ACME Company randomly sampled nine light bulbs and measured how many hours they lasted .

378, 361, 350, 375, 200, 391, 375, 368, 321

sample size : n=9

4. Range = Maximum value - Minimum value

= 391-200= 191

∴Range = 191

5 . Let x denotes the data values.

Mean $\overline{x}=346.6$

x $(x_i-\overline{x})$ $(x_i-\overline{x})^2$

378 31.4 985.96

361 14.4 207.36

350 3.4 11.56

375 28.4 806.56

200 - 146.6 21491.56

391 44.4 1971.36

375 28.4 806.56

368 21.4 457.96

321 -25.6 655.36

$\sum(x_i-\overline{x})^2=27394.24$

Variance = $=\dfrac{\sum(x_i-\overline{x})^2}{n-1}$

$=\dfrac{27394.24}{8}=3424.28\approx3424.3$

∴ Variance =3424.3

5. Standard deviation = $\dsqrt{Variance}=\sqrt{3424.28}=58.5173478551\approx58.5$

∴ Standard deviation =58.5

Answer from: Quest

sgth thdhtxr ythdsx hfgh ysrth th srtrh

step-by-step explanation:

trshd h rdhsjsdrnytjdt jyjyukfddythj

Answer from: Quest

step-by-step explanation:

given

y + 3 = - 4(x - 2) ← distribute the parenthesis

y + 3 = - 4x + 8 ( subtract 3 from both sides )

y = - 4x + 5 → d

Which of the following equations is equivalent to y+3=-4(x-2)?

Other questions on the subject: Mathematics

Mathematics, 21.06.2019 16:00, Jenifermorales101

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Answers: 1

continue

Mathematics, 21.06.2019 19:30, hrcatena

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Answers: 3

continue

Mathematics, 21.06.2019 20:00, mercedespennewp72wea

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. 4x^2 + 20x + 25 = 0

Answers: 2

continue

Mathematics, 21.06.2019 20:00, chantelporter713

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

Answers: 1

continue

You know the right answer?

Quality control is an important issue at acme company which manufactures light bulbs. in order to co...