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
9966 [12]
2 years ago
11

HELP PLEASE !! NEED HELP ASAPPP !! Will give brainliest !!!

Mathematics
1 answer:
drek231 [11]2 years ago
3 0

Answer:

1. 37° 2. 140

Step-by-step explanation:

They are supplementary angles, so the angle measures equal a straight line, or 180 degrees. 180 - 143 = 37

You might be interested in
2a +5 - 3a -12 please
chubhunter [2.5K]

Answer:

-7-a

Step-by-step explanation:

2a-3a +5-12

-a - 7

or -7-a

7 0
2 years ago
Read 2 more answers
NEED HELP PLZ!!!!!!!!!!!!!
podryga [215]

Answer:

1st Option is correct

Step-by-step explanation:

Just keep adding 150 to see the results

8 0
2 years ago
The quality control manager of a chemical company randomly sampled twenty 100-pound bags of fertilizer to estimate the variance
lisabon 2012 [21]

Answer:

The 95% confidence interval for the variance in the pounds of impurities would be 3.829 \leq \sigma^2 \leq 14.121.

Step-by-step explanation:

1) Data given and notation

s^2 =6.62 represent the sample variance

s=2.573 represent the sample standard deviation

\bar x represent the sample mean

n=20 the sample size

Confidence=95% or 0.95

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population mean or variance lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.

The Chi square distribution is the distribution of the sum of squared standard normal deviates .

2) Calculating the confidence interval

The confidence interval for the population variance is given by the following formula:

\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma^2 \frac{(n-1)s^2}{\chi^2_{1-\alpha/2}}

On this case the sample variance is given and for the sample deviation is just the square root of the sample variance.

The next step would be calculate the critical values. First we need to calculate the degrees of freedom given by:

df=n-1=20-1=19

Since the Confidence is 0.95 or 95%, the value of \alpha=0.05 and \alpha/2 =0.025, and we can use excel, a calculator or a table to find the critical values.  

The excel commands would be: "=CHISQ.INV(0.025,19)" "=CHISQ.INV(0.975,19)". so for this case the critical values are:

\chi^2_{\alpha/2}=32.852

\chi^2_{1- \alpha/2}=8.907

And replacing into the formula for the interval we got:

\frac{(19)(6.62)}{32.852} \leq \sigma^2 \frac{(19)(6.62)}{8.907}

3.829 \leq \sigma^2 \leq 14.121

So the 95% confidence interval for the variance in the pounds of impurities would be 3.829 \leq \sigma^2 \leq 14.121.

4 0
3 years ago
The time until failure of an electronic device has an exponential distribution with mean 15 months. If a random sample of five s
Ainat [17]

Answer:

The probability that the first failure occurs among the five devices is given by

(a) 9 months =\frac{9}{15} or  =0.6

(b) 12 months=\frac{12}{15} or = 0.8

Step-by-step explanation:

probability is given as the; number of required outcome/ total number of possible outcome.

6 0
3 years ago
What is the answer to 4c+5=4c-7
Evgesh-ka [11]
The answer would be 12
8 0
3 years ago
Other questions:
  • If y varies inversely as x and y=3 when x=4, then y=12 when x=15 <br><br> True or false ?
    12·1 answer
  • What is the mass of 75¢ in nickels?
    5·1 answer
  • JACOB WALKS 70.4 FEET IN 0.2 HOUR. IF HE WALKS AT THE SAME RATE THE WHOLE TIME, WHAT IS HIS SPEED IN FEET PER HOUR?
    12·1 answer
  • Equivalent radios to 2:12
    9·1 answer
  • Someone help me get my head around this ?<br> ((the fraction part))
    12·1 answer
  • Find the least common denominator! Photo added! Just need a quick answer for now! Thanks in advance!
    13·1 answer
  • A function is defined by the points {(0,2), (2,3), (5,9), (7,2)}. Which ordered pair can we add to the set to keep it a function
    8·1 answer
  • Guess this riddle it’s about thanksgiving
    7·2 answers
  • Please help!! ASAP thanks
    15·1 answer
  • A satellite weighs 150 pounds on Earth. Using
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!