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
andrezito [222]
3 years ago
7

Abe has a bag of marbles and wants to divide them into sets. The first set will have 2 marbles; the second set, 5; the third set

, 8; the fourth set, 11; and so on. How many sets will he have if he starts with 40 marbles?
Mathematics
1 answer:
uranmaximum [27]3 years ago
5 0

2 + 5 = 7

7 + 8 = 15

15 +11 = 26

11+3 = 14

26 + 14 = 40

 so he has 5 sets

You might be interested in
-14+7-5+(-16) <br> Thank youuuu
masha68 [24]
I think it is -28?????????
6 0
3 years ago
Please help me please
Norma-Jean [14]
Im blind SKDJFJNEDKODNANSRNFIS
3 0
3 years ago
Read 2 more answers
1. A food safety guideline is that the mercury in fish should be below 1 part per million​ (ppm). Listed below are the amounts o
Sauron [17]

Answer:

The confidence interval estimate of the population mean is :

(0.61 ppm, 0.90 ppm)

The correct option is (A).

Step-by-step explanation:

The amounts of mercury​ (ppm) found in tuna sushi sampled at different stores in a major city are:

S = {0.58, 0.82, 0.10, 0.98, 1.27, 0.56, 0.96}

A (100-\alpha )\% confidence interval for the population mean (μ) is an interval estimate of the true value of the mean. This interval has a (100-\alpha )\% probability of consisting the true value of mean.

⇒ Since the population standard deviation is not provided we will use the <em>t</em>-distribution to construct the 99% confidence interval for mean.

⇒ The formula for confidence interval for the population mean is:

                                          \bar x\pm t_{\alpha/2,(n-1)}\times \frac{s}{\sqrt{n}}

Here,

\bar x = sample mean

<em>s </em>= sample standard deviation

<em>n</em> = sample size

t_{\alpha/2,(n-1)} = critical value.

The degrees of freedom for the critical value is, (<em>n</em> - 1) = 7 - 1 = 6.

The significance level is: \alpha =1-Confidence\ level=1-0.99=0.01

The critical value is:

t_{\alpha/2,(n-1)}=t_{0.01/2, 7}=t_{0.05,7}=3.143

**Use the <em>t</em>-table for the critical value.

Compute the sample mean and sample standard deviation as follows:

\bar x=\frac{1}{7}(0.58+ 0.82+ 0.10+ 0.98+ 1.27+ 0.56+ 0.96) =0.753

\int\limits^a_b {x} \, dx s=\sqrt{\frac{\sum (x{i}-\bar x)^{2}}{n-1} } =\sqrt{\frac{1}{6} \times 0.859743} =0.379

The 99% confidence interval for μ is:

x^{2} CI=0.753\pm 3.143\times\frac{0.379}{\sqrt{7}} \\=0.753\pm0.143\\=(0.61, 0.896)\\\approx(0.61, 0.90)

The confidence interval estimate of the population mean is:

(0.61 ppm, 0.90 ppm)

The upper and lower limit of the 99% confidence interval indicates that the true mean value is less than 1 ppm. This implies that there is not too much mercury in tuna sushi

Because it is possible that the mean is not greater than 1 ppm. Also, at least one of the sample values is less than 1 ppm, so at least some of the fish are safe.

Thus, the correct option is (A).

6 0
3 years ago
A system of equations is shown below
wariber [46]

Answer:

No solution

Step-by-step explanation:

7 0
2 years ago
In 2005 there were 1352 students in 2006 there were 1014 students work out the decrease in the number of students
Eduardwww [97]
I’m. It sure but I need points so sorry
6 0
3 years ago
Other questions:
  • how to graph each pair of parametric equations using the graphing calculator? x = 3 sin^3t y = 3 cos^3t
    9·1 answer
  • For Halloween, 1/4 of the candy sold was chocolate. Of the chocolate sold, 7/8 was made by Nestle. What fraction of all the cand
    7·1 answer
  • Plz help!!!!!!!!!!!!!
    8·2 answers
  • What is the definition for associative property of multiplication in your own words and explain how you would use it to compute
    14·2 answers
  • The answer might be flipped just so you know
    5·1 answer
  • Can someone please help me with a, b, and c? I don't get it and it's due tomorrow : (
    5·1 answer
  • Calvin paints pictures and sells them at art shows. He charges $ 56.25 for a large painting. He charges $25.80 for a small paint
    9·2 answers
  • Solve the problem below
    7·2 answers
  • Help loll i’m confused
    10·1 answer
  • Which of the following represents a reflection of (-3, 4) across the y-axis?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!