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
netineya [11]
3 years ago
11

The weights (to the nearest pound) of some boxes to be shipped are found to be:. Weight 65 68 69 70 71 72 90 95 frequency 1 2 5

8 7 3 2 2 Their mean weight is 72.97 pounds. What is the standard deviation of these weights? The standard deviation, to the nearest tenth, is a0.
Mathematics
1 answer:
Lena [83]3 years ago
7 0
So the mean is 72.97

We need to subtract the mean from each value and square it.
(65-72.97)^2= 63.5209
(68-72.97)^2=24.7009
(69-72.97)^2=15.7609
(70-72.97)^2=8.8209
(71-72.97)^2= 3.8809
(72-72.97)^2=0.9409
(90-72.97)^2=290.0209
(95-72.97)^2=485.3209

Now we add up the new values ( also consider their frequency) and find their mean.
Add the values
63.5209+(2 •24.7009=49.4018)+(5•15.7609=78.8045)+(8•8.8209=70.5672)+(7•3.8809=27.1663)+(3•0.9409=2.8227)+(2•290.0209=580.0418)+(2•485.3209=970.6418)= 1,842.967
Divide by total numburs to find the mean
1,842.967/ 30=61.43223333

The standar deviation is the square root of the mean so is
Square root of 61.43223333=7.837871735
Round to the nearest tenth
Standard Deviation is 7.8



You might be interested in
Jason is shopping at a store for a shirt. He has a coupon that will reduce the original price of the shirt by $2. A 4% sales tax
kvv77 [185]

Answer:

Hi thats the answer.

Step-by-step explanation:

5 0
2 years ago
Match the expressions with the nonpermissible replacements for y
pantera1 [17]

<em>-7 _D_</em>

<em>\frac{3}{2} _A_</em>

<em>1 _C_</em>

<em>\frac{-1}{4} _B_</em>

<em>_A_ \frac{y^{2} -2y+1}{2y-3}</em>

<em>_B_ \frac{y(y+5)}{4y+1}</em>

<em>_C_ \frac{5y^{2}-6y+1 }{-5(y-1)}</em>

<em>_D_ \frac{y^{2}-y-6 }{-2(y+7)}</em>


3 0
3 years ago
Read 2 more answers
Which lists show numbers ordered from least to greatest? Choose all that apply.
saw5 [17]
The answer is C. -<span>3 3/4, -2 1/4, 1 1/8 

It is because the highest number in the negatives, -3 3/4, is always the lowest. Obviously if there is no negative sign it is positive. 1 1/8 is the only positive so it is the greatest. And -2 1/4 is lower that -3 3/4. So it is higher than -3 3/4 but lower than 1 1/8.

I'm sorry I'm not the best explainer, but does this help?</span>
7 0
3 years ago
Assume that the heights of women are normally distributed with a mean of 63.6 inches and a standard deviation of 2.5 inches. If
djyliett [7]

Answer:

Option a. 0.9811

Step-by-step explanation:

First, you need to use a normal distribution table to solve this. If you don't have it, then see the attached table so you can guide yourself.

Now, we want to know the probability of randomly select 75 women whose height have a mean between 63 and 65 inches, knowing that in general, the mean is 63.5 and standard deviation of 2.5

To do this, you should calculate first the Z score value for both heights, one for 63 inches and the other with 65 inches. Then, with those values, we'll look the table to get the area under the curve, and thus, the probability. To calculate Z use the following expression:

Z = x - μ / (σ/√n)

Where:

μ: mean height

σ: standard deviation

x: height required

n: sample population

We have all the data so let's calculate both values of Z:

Z1 = 63 - 63.6 / (2.5/√75) = -2.08

Z2 = 65 - 63.6 / (2-5/√75) = 4.85

With these Z score, let's watch the table, and see which area belongs to,

In the case of Z1, the area is 0.0188, while Z2 is 1.

To know the probability, all we need to do is substract those values:

P = 1 - 0.0188 = 0.9812

Option a) is the most accurate and closest result to this.

5 0
3 years ago
Can someone please help me with math.
Damm [24]

Answer:

The answer is 2/10 which simplifies to 1/5

I don't know the second one:(

4 0
3 years ago
Other questions:
  • PLEASE HELP Function Stories You’ve seen how we can use different functions to model real-world situations, and you’ve studied t
    9·1 answer
  • 2x + 2x + 2 = 4x + 2<br><br><br>PLEASE ANSWER ASAP! I'll send u 5 dollars ! but please hurry :(​
    5·1 answer
  • Which equation shoes how the properties of numbers extend to negative whole numbers by commutative property of addition A) -2+4=
    6·1 answer
  • In triangle ABC, the measure of angle BCA is 90, segment AC is 12 units, and segment BC is 9 units. If D is a point on hypotenus
    13·1 answer
  • 1/100000 as a power of 10
    13·1 answer
  • What is the slope of a line parallel to the line 2x + 3y = 5?
    11·2 answers
  • Write a story about temperatures that this expression could represent:<br><br> 27 + (-11)
    13·1 answer
  • Laila is setting up a conical tent in the backyard. The height of the tallest part of the tent is 7 feet. The inside of the tent
    9·2 answers
  • 5.000g rounded to the nearest whole gram
    5·2 answers
  • Triangle ABC has vertices at A(−3, 4), B(4, −2), C(8, 3). The triangle translates 2 units up and 1 unit right. Which rule repres
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!