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
vodka [1.7K]
3 years ago
9

A teacher graded the tests for each of her students. She calculated a mean grade of 80 and a

Mathematics
1 answer:
son4ous [18]3 years ago
7 0

Answer:

Katrina got 86 in her test

Step-by-step explanation:

given

mean = 80

standard deviation = 3

z-score = 2

Let score of Katrina = x

Recall z-score is calculated by

z-score = (x-mean) / standard deviation

substitute values and solve for x

2 = (x-80)/3

x-80=6

x = 86

You might be interested in
Evaluate the expression.
PilotLPTM [1.2K]

c

4x-5y

4x3=12

5x2=10

12-10=2

5 0
4 years ago
Suppose a company did $3,000,000 in annual maintenance in 2013 and expects 85% of those to renew for 2014. Suppose that product
Veseljchak [2.6K]

Answer:

In year 2013 annual maintenance done = $ 3,000,000

Out of this 85% is expected to renew in 2014 = 0.85\times3000000 = $2,550,000

Now Sales in 2013 = $3,000,000

60% of these sales = 0.60\times3000000 = $1,800,000

Now out of this 60%, 20% annual maintenance was expected to be paid

In 2014 = 0.20\times1800000 = $360000

So, Total annual maintenance in 2014 = 2550000+360000

= $2,910,000

8 0
4 years ago
​What's wrong with the following​ statement?
NeTakaya

Answer:

It is not a normal distribution but an uniform distribution

Step-by-step explanation:

A uniform distribution is one in which all values are equally likely within a range, therefore in lottery drawings, any of the numbers are likely to appear, however a normal distribution the values are likely to cluster around the mean, or average. Meaning that numbers far away from the mean won't appear that often, however, in lottery drawings, this normal distribution doesn't happen.

4 0
3 years ago
A car averages 27 miles per gallon. If gas costs $4.04 per gallon, which of the following is closest to how much the gas would c
worty [1.4K]

Answer:

Option D is correct.

$408.04 the gas would cost for this car to travel 2,727 typical miles

Step-by-step explanation:

Unit rate defined as the rates are expressed as a quantity 1 such as 3 miles per second or 4 kilometer per hour

As per the statement:

A car averages 27 miles per gallon.

⇒\text{Unit rate per gallon} = 27 miles

Total distance of car travel typical miles = 2727 miles.

\text{Number of gallons}=\frac{\text{Total distance}}{\text{Unit rate per gallon}}

Substitute the given values we have;

\text{Number of gallons} = \frac{2727}{27} = 101

It is also given that if gas costs $4.04 per gallon.

then;

In 1 gallon of gas = $4.04

then;

in 101 gallons of gas = 101 \cdot 4.04 = \$408.04

Therefore, $408.04 the gas would cost for this car to travel 2,727 typical miles

8 0
3 years ago
Remove parentheses by applying the Distrubitive Property. 5x^2(7- x^2)
Sunny_sXe [5.5K]

Answer:

35x^2-5x^4

Step-by-step explanation:

You have to multiply the numbers on the outside to the numbers on the inside.

For example, 5x^2 times 7 would be 35x^2.

3 0
3 years ago
Other questions:
  • A random sample of 50 units is drawn from a production process every half hour. the fraction of nonconforming product manufactur
    8·1 answer
  • What function has a zero of -5
    13·1 answer
  • A ladder is leaning against a wall. The top of the ladder is 9 feet above the ground. If the bottom of the ladder is moved 3 ft
    15·1 answer
  • PLEASE HELP ASAP!!!!!
    7·1 answer
  • Which fraction is equivalent to negative 1 over 6?
    10·2 answers
  • How many rhombuses in a trapezoid?<br>​
    13·2 answers
  • I need help asap! What is the area of this shape below in the image
    14·2 answers
  • I need help i will mark brainlest
    12·2 answers
  • Hey! This is due at like 11 pm!
    9·2 answers
  • PLS HELP ME ASAP I WiLL MARK THE BRAINLIEST
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!