answer.
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
GrogVix [38]
2 years ago
9

Emi computes the mean and variance for the population data set 87, 46, 90, 78, and 89. She finds the mean is 78. Her steps for f

inding the variance are shown below. mc008-1.jpg What is the first error she made in computing the variance? Emi failed to find the difference of 89 - 78 correctly. Emi divided by N - 1 instead of N. Emi evaluated (46 - 78)2 as -(32)2. Emi forgot to take the square root of -135.6.
Mathematics
2 answers:
HACTEHA [7]2 years ago
7 0
Well let’s find the actually mean

First we add up all the numbers

87+46+90+78+89 = 390

Next we divide 390 by how many numbers there are.

390/5 = 78

Therefore the mean is 78

Emi failed to find the difference
Snowcat [4.5K]2 years ago
4 0
It's C. <span>Emi evaluated (46 - 78)2 as -(32)2.</span>
You might be interested in
Write an arithmetic series for which S5 = 10.
Ludmilka [50]
S5=10 means the 5th number is 10. 
So the arithmetic sequence is s1, s2,s3, s4, 10
3 0
2 years ago
Suppose that a system has 5000 grasshoppers. how many hawks would be expected?
aliina [53]
Probably 2500 or less because they dont need that much hawks.

3 0
2 years ago
Kirsten invested $1800 in an account paying 2% simple interest. What was her account balance after 5 years?
Maurinko [17]

Answer:

$1,980

Step-by-step explanation:

We can use the simple interest formula for this:

A = P (1 + rt)

<em>P = initial balance</em>

<em>r = annual interest rate</em>

<em>t = time</em>

<em />

First, change 2% into its decimal form:

2% -> \frac{2}{100} -> 0.02

Now, lets plug the values into the equation:

A=1,800(1+(0.02)(5))

A=1,980

The account balance after 5 years is $1,980

6 0
2 years ago
Find the derivative of f(x) = 11x2 + 5x at x = 9.
Yakvenalex [24]
F(x) = 11x² + 5x 

f'(x) = 22x + 5

Hence,

f'(9) = (22 * 9) + 5 = 198 + 5 = 203
3 0
2 years ago
Read 2 more answers
Chuck has a gross pay of $815.70. By how much will Chuck’s gross pay be reduced if he has the following items withheld? federal
tangare [24]

Chuck has a gross pay of $815.70. His gross pay will be reduced by:

  • Federal tax of $56;
  • Social Security tax that is 6.2% of his gross pay;
  • Medicare tax that is 1.45% of his gross pay;
  • State tax that is 19% of his federal tax.

Let's count:

1. gross pay of $815.70 - 100%,

Social Security tax of $x - 6.2%.

Then

\dfrac{815.70}{x}=\dfrac{100}{6.2} ,\\ \\815.70\cdot 6.2=x\cdot 100,\\ \\x=\dfrac{815.70\cdot 6.2}{100} =50.5734.

2. gross pay of $815.70 - 100%,

Medicare tax of $y - 1.45%.

Then

\dfrac{815.70}{y}=\dfrac{100}{1.45} ,\\ \\815.70\cdot 1.45=y\cdot 100,\\ \\y=\dfrac{815.70\cdot 1.45}{100} =11.82765.

3. Federal tax of $56 - 100%,

State tax $z - 19%.

Then

\dfrac{56}{z}=\dfrac{100}{19} ,\\ \\56\cdot 19=z\cdot 100,\\ \\z=\dfrac{56\cdot 19}{100} =10.64.

4. Chuck’s gross pay will be reduced by

\$56+\$50.5734+\$11.82765+\$10.64=\$129.04105\approx \$129.04.

3 0
2 years ago
Read 2 more answers
Other questions:
  • Vivian electronically transferred $398.65 from her checking account to Luther's checking account. In what column of the check re
    14·2 answers
  • You are planning to buy one of two brands of sofas, which you hope to use over the next twenty years. brand j costs $975 and las
    8·2 answers
  • Sally’s parents deposited $15,000 into a college savings account on her third birthday. The account had an interest rate of 9.6%
    8·2 answers
  • A deck of playing cards has four suits, with thirteen cards in each suit consisting of the numbers 2 through 10, a jack, a queen
    9·2 answers
  • Anita is making a curtain to surround a table. She bought 3 1/4 yards of frabric. Her total cost was 13$ , what was the cost per
    5·1 answer
  • Olivia had math and reading homework tonight. Olivia can solve each math problem in 1 minute and she can read each page in 1.5 m
    10·1 answer
  • Alan bought a used bicycle for $115. After reconditioning it, he added 225% markup and then advertised it for sale. What is the
    8·2 answers
  • Flights from Miami for New York City are delayed 27% of the time. How likely is it that a particular traveler's flight from Miam
    7·1 answer
  • Recunoasteti triunghiurile isoscele din figurile de mai jos:
    6·1 answer
  • Mention the commutativity associative and distributive properties of rational number
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!