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
kati45 [8]
3 years ago
8

Carl can do a particular job in 4

Mathematics
2 answers:
Sergio [31]3 years ago
8 0

Answer:

The time of working together is x

So

1/x=1/4+1/6.5

x = 2.48

So the time of working together is 2.48 hrs

Step-by-step explanation:

allsm [11]3 years ago
3 0

Answer:

2.5 hours

Step-by-step explanation:

You might be interested in
Pls only put the right answer
Makovka662 [10]

Answer:

100°

Step-by-step explanation:

No explanation, by  your request.

3 0
2 years ago
PLS HELP!! AS SOON AS POSSIBLE !!
Colt1911 [192]
23 .........................
3 0
3 years ago
Assume the average height for American women is 64 inches with a standard deviation of 2 inches. A sorority on campus wonders if
satela [25.4K]

Answer:

a) s = 0.4

b) Z = 2.5

c) 99th percentile.

d) The larger sample size would lead to a smaller margin of error, which would lead to a higher z-score and a increased percentile.

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 normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score 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 p-value, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem establishes 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 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.

Assume the average height for American women is 64 inches with a standard deviation of 2 inches

This means that \mu = 64, \sigma = 2

A) Calculate the standard error for the distribution of means.

Sample of 25 means that n = 25, so s = \frac{2}{\sqrt{25}} = 0.4.

B) Calculate the z statistic for the sorority group.

Sample mean of 65 means that X = 65.

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

By the Central Limit Theorem

Z = \frac{X - \mu}{0.4}

Z = \frac{65 - 64}{0.4}

Z = 2.5

C) What is the approximate percentile for this sample? Enter as a whole number.

Z = 2.5 has a p-value of 0.9938, so 0.99*100 = 99th percentile.

D) If the sorority actually had 36 members (still with an average of 65 inches), would you expect the percentile value to increase or decrease? why?

The larger sample size would lead to a smaller margin of error, which would lead to a higher z-score and a increased percentile.

3 0
2 years ago
Using the Order of Operations, what is the solution to 2(4/2)2 - 15 + 6?
PIT_PIT [208]
<span>2(4/2)^2 - 15 + 6
= </span><span>2(2)^2 - 15 + 6
= </span><span>2(4) - 15 + 6
= 8 - 15 + 6
= -1</span>
3 0
2 years ago
Read 2 more answers
The price of one share of Acme Company declined $5 per day for 4 days in a row. How much did the price of one share change in th
Ksju [112]
If the price went down $5 per day for four days straight, then it would have went down $20 total after the four days.
7 0
2 years ago
Read 2 more answers
Other questions:
  • What is the area of a sheet of binder paper? (Binder paper is 8 1/2 inches by 11 inches.) 88 inches 88 1/2 in2 93 1/2 in2 94 in2
    13·1 answer
  • How do I find 45% of 320 by multiplying?
    11·2 answers
  • a line passes through -2 and 5 and has a slope of 1/3 what is an equation of the line in a point slope form
    6·1 answer
  • 0.000014565 in scientific notation
    14·1 answer
  • What is the distance between 1st and 3rd base?
    15·1 answer
  • what number should be added to the expression x^2 + 10x to change it into a perfect square trinomial?​
    9·2 answers
  • 7,857,462 into scientific notation
    14·2 answers
  • D<br> B<br> 3x43<br> IC<br> 4x+2<br> Determine the value of mZDCB.
    13·1 answer
  • Differentiate with product rule<br><br>​
    11·1 answer
  • Comments) How many of you go to K12 for school?
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!