1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Papessa [141]
3 years ago
11

An article reported the following data on oxidation-induction time (min) for various commercial oils:87 105 130 160 180 195 135

145 213 105 145151 152 136 87 99 92 119 129(a) Calculate the sample variance and standard deviation. (Round your answers to three decimal places.)s^2 = ________. min^2s = ________. min(b) If the observations were reexpressed in hours, what would be the resulting values of the sample variance and sample standard deviation? Answer without actually performing the reexpression. (Round your answer to three decimal places.)s^2 =______ hr^2s = ______hr
Mathematics
1 answer:
Alona [7]3 years ago
3 0

Answer:

Step-by-step explanation:

Mean = (87 + 105 + 130 + 160 + 180 + 195 + 135 + 145 + 213 + 105 + 145 + 151 152 + 136 + 87 + 99 + 92 + 119 + 129)/19 = 129

Variance = (summation(x - mean)²/n

Standard deviation = √(summation(x - mean)²/n

n = 19

Variance = [(87 - 129)^2 + (105 - 129)^2 + (130 - 129)^2+ (160 - 129)^2 + (180 - 129)^2 + (195 - 129)^2 + (135 - 129)^2 + (145 - 129)^2 + (213 - 129)^2 + (105 - 129)^2 + (145 - 129)^2 + (151 - 129)^2 + (152 - 129)^2 + (136 - 129)^2 + (87 - 129)^2 + (99 - 129)^2 + (92 - 129)^2 + (119 - 129)^2 + (129 - 129)^2]/19 = 23634/19 1243.895 min

Standard deviation = √1243.895 = 35.269 min

60 minutes = 1 hour

Converting the variance to hours,

Each division would have been divided by 60². 60² can be factorized out

Variance = 23634/60² = 6.565 hours

Converting the standard deviation to hours, it becomes

√6.565 = 2.562 hours

You might be interested in
Which is an equation of the line that passes through (4, -5) and (6, 9)?
ozzi

Answer:

try 21 x 21 plus 21 divided by 21 then add 21 x 21

Step-by-step explanation:

easy math

7 0
3 years ago
Read 2 more answers
What is the approximate solution of this system of equations?
Effectus [21]
Hmm, I'd say it's the first option.
3 0
3 years ago
What is the simplified form of the following expression? Assume
HACTEHA [7]

Answer:

yes a

Step-by-step explanation:

4 0
3 years ago
One warehouse had 185 tons of coal, another one had 237 tons. The first warehouse delivered 15 tons of coal to its clients daily
LenKa [72]

Hello Archanavrane75p56yu7

The answer to this problem would be 9 days for the second warehouse if 1.5 times than the first one.

:)

P.S (Dont cry)

7 0
3 years ago
Eureka math lesson 5 5.3
dangina [55]

A is 1/12.

B is 1/6.

C is 7/12.

D is 11/21


3 0
3 years ago
Read 2 more answers
Other questions:
  • Vlad spent 20 minutes on his history homework and then completely solved x math problems that each took 2 minutes to complete. W
    9·2 answers
  • Simplify -16 -22+ 22) A. -16 B. 39 C. 16 D.38 Help me PLZZZZZZ ;(
    5·2 answers
  • An ethanol plant added a new tank that holds 350 barrels of ethanol gasoline more than its old tank. Together, they hold 3,650 b
    14·1 answer
  • Write a subtraction problem involving regrouping that has Ted reading 304 pages
    6·1 answer
  • Tonya's grandma has two pieces of cloth. She wants to estimate how much longer one piece is than the other. She will estimate to
    12·1 answer
  • 1. (8-2)+18×6= 2. (15+29-4)×4= 3. (13+5)×(13-5)= show steps please
    7·1 answer
  • if you sell a stock for more money than you paid for it, you have a gross capital loss. true or false
    5·1 answer
  • There are 4 identical wooden blocks that are 20 inches long, 2 inches wide, and 1 inch thick. If you glue them together, what is
    9·1 answer
  • Mrs. Barkley had 75 feet of ribbon. If each of the 18 students in her class gets an equal length of ribbon, how many inches of r
    5·1 answer
  • Need help Pronto! Will give braintliest.
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!