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
Zigmanuir [339]
3 years ago
13

Help on this question plss!

Mathematics
2 answers:
GuDViN [60]3 years ago
7 0
Adding 4 to both side is wrong he has to be subtract 4 to both side
mart [117]3 years ago
4 0

Answer:

adding 4 to both sides. first option.

Step-by-step explanation:

four should have been subtracted, as it is <u>not</u> negative

You might be interested in
Majesty Video Production Inc. wants the mean length of its advertisements to be 26 seconds. Assume the distribution of ad length
Paladinen [302]

Answer:

a) By the Central Limit Theorem, approximately normally distributed, with mean 26 and standard error 0.44.

b) s = 0.44

c) 0.84% of the sample means will be greater than 27.05 seconds

d) 98.46% of the sample means will be greater than 25.05 seconds

e) 97.62% of the sample means will be greater than 25.05 but less than 27.05 seconds

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal probability distribution

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation(also called standard error) s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

In this problem, we have that:

\mu = 26, \sigma = 2, n = 21, s = \frac{2}{\sqrt{21}} = 0.44

a. What can we say about the shape of the distribution of the sample mean time?

By the Central Limit Theorem, approximately normally distributed, with mean 26 and standard error 0.44.

b. What is the standard error of the mean time? (Round your answer to 2 decimal places)

s = \frac{2}{\sqrt{21}} = 0.44

c. What percent of the sample means will be greater than 27.05 seconds?

This is 1 subtracted by the pvalue of Z when X = 27.05. So

Z = \frac{X - \mu}{\sigma}

By the Central Limit Theorem

Z = \frac{X - \mu}{s}

Z = \frac{27.05 - 26}{0.44}

Z = 2.39

Z = 2.39 has a pvalue of 0.9916

1 - 0.9916 = 0.0084

0.84% of the sample means will be greater than 27.05 seconds

d. What percent of the sample means will be greater than 25.05 seconds?

This is 1 subtracted by the pvalue of Z when X = 25.05. So

Z = \frac{X - \mu}{s}

Z = \frac{25.05 - 26}{0.44}

Z = -2.16

Z = -2.16 has a pvalue of 0.0154

1 - 0.0154 = 0.9846

98.46% of the sample means will be greater than 25.05 seconds

e. What percent of the sample means will be greater than 25.05 but less than 27.05 seconds?"

This is the pvalue of Z when X = 27.05 subtracted by the pvalue of Z when X = 25.05.

X = 27.05

Z = \frac{X - \mu}{s}

Z = \frac{27.05 - 26}{0.44}

Z = 2.39

Z = 2.39 has a pvalue of 0.9916

X = 25.05

Z = \frac{X - \mu}{s}

Z = \frac{25.05 - 26}{0.44}

Z = -2.16

Z = -2.16 has a pvalue of 0.0154

0.9916 - 0.0154 = 0.9762

97.62% of the sample means will be greater than 25.05 but less than 27.05 seconds

8 0
3 years ago
1. Which words represent ADDITION<br> less than<br> sum<br> more than<br> times
Vlad1618 [11]

Answer:

more than

Step-by-step explanation:

8 0
3 years ago
Plz help! Correct gets brainliest :) I think I know the answer I just want to double check
Gnom [1K]

9x - 24 + 4x = -24 + 14x - x

13x - 24 = 13x - 24

0 = 0

Answer is All real numbers

4 0
3 years ago
Read 2 more answers
4. Is it possible to have a triangle with the sides 6.1 cm, 3.2cm, 2.4cm? Justify your reason with suitable reason.
Dahasolnce [82]
Answer: No
Explanation: There is a rule that stays that a triangle's 2 least sides must add up to be greater than the biggest side. 3.2 plus 2.4 is not greater than 6.1.
3 0
2 years ago
What us probabilith<br>​
julia-pushkina [17]

♫ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ♫

➷Probability is the chance of getting something randomly.

✽

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

TROLLER

5 0
3 years ago
Other questions:
  • Alright guys, HELP! Please!
    5·1 answer
  • Place the indicated product in the proper location on the grid. [4 - (3c - 1)] [6 - 3c -1)]
    9·1 answer
  • The area of a semicircle is A=1/2(3.14)r^2 solve for r
    7·1 answer
  • Two missiles are initially 5000 miles apart. They travel along a straight line directly towards one another, one traveling at 20
    15·1 answer
  • The product of a whole number and unit fraction 2/3
    15·1 answer
  • What is the answer to x + 23 = 15
    7·2 answers
  • Can someone please help? im really confused.
    12·1 answer
  • Find the area of a sector with a central angle of 126 degrees and a radius of 11.8 m. Round to the nearest tenth.
    12·1 answer
  • Please Hurry! I will award the first person right the brainlyest award
    14·2 answers
  • two boys decided to buy a computer. The second boy had 5/6 of the amount of money the first had. The first boy had 7/8 of the pr
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!