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
nignag [31]
3 years ago
11

The grades on the last history exam had a mean of 75%. Assume the population of grades on history exams is known to be normally

distributed with a standard deviation of 7. What percent of students earn a score between 70% and 82%?
Mathematics
1 answer:
RUDIKE [14]3 years ago
6 0
34% . <span>Since going from 75% to 82% is simply the right portion of that middle, the answer is half of 68%, or 34%.</span>
You might be interested in
simplify the following expression: (x+7/4x) + (5/x-8) I also attached a photo of the problem if you get confused on how I typed
Gnoma [55]

Answer:

\frac{x^{2}  + 19x - 56}{4 {x}^{2}   - 32x}

Step-by-step explanation:

Start by making the denominators of both fraction the same. This can be done by multiplying one fraction's denominator by the other.

After simplifying and combining the two fractions together, check if the numerator can be factorised such that there is a common factor in the denominator and numerator. In this case, the numerator cannot be factorised.

Lastly, expand the denominator.

\frac{x + 7}{4x}  +  \frac{5}{x - 8}

=  \frac{(x + 7)(x - 8)}{4x(x - 8)}  +  \frac{5(4x)}{4x(x - 8)}

=  \frac{x(x) + x( - 8) + 7(x) + 7( - 8) + 20x}{4x(x - 8)}

=  \frac{ {x}^{2} - 8x + 7x - 56 + 20x }{4x(x - 8)}

=  \frac{ {x}^{2}  + 19x - 56}{4x(x - 8)}

=  \frac{ {x}^{2}  + 19x - 56}{4 {x}^{2}  -  32x}

7 0
2 years ago
Can someone find an equation for this because I am stuck on this. Thanks
Vera_Pavlovna [14]

Answer:

y = 11.5x - 18

Step-by-step explanation:

i created this table in desmos and then entered this equation underneath:

y₁ (tilda sign) = mx₁ + b

desmos will draw a line of best fit and provide the correlation coefficient, slope, and y-intercept

7 0
3 years ago
if you flip a coin 10 times, what is the best prediction​ possible for the number of times it will land on heads?
SVETLANKA909090 [29]
Proabably. 5 because if there is 2 sides on a coin then you should divide 10÷2 which is 5.
4 0
3 years ago
Read 2 more answers
I need help please and thank you
d1i1m1o1n [39]

Answer:

8.08

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
X+56&lt;533. What is the solution of the inequality?
swat32
X<477


hope this helps<3
7 0
3 years ago
Other questions:
  • four students had the following amounts of money in their pockets:$3.14,$67,$2.45,and$1.14.how much money did they have total?br
    15·1 answer
  • Kevin is taking a taxi from the airport to his home. There is a $6 flat fee for riding in the taxi. In addition, Kevin must also
    10·1 answer
  • Can someone help me with this please and explain how they got the answer, please and thank you!
    8·2 answers
  • The cargo box of an 18-wheeler truck has an inside length of 39.6 feet,width of 7.6 feet,and a height of 8.8 feet.What is the ca
    9·1 answer
  • Display the set of data in a histogram.
    14·1 answer
  • The subset of the real number for 13
    15·1 answer
  • Solve and show work. 4-(6x+5)=7-2(3x+4)
    10·1 answer
  • A candy machine can make 25.15 pounds of candy in an hour. How much candy can it make in 6.5 hours?
    13·2 answers
  • I need help finding the measure of the angles
    12·1 answer
  • Percentage:
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!