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kogti [31]
3 years ago
10

The time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard deviation of 10 minus.

Using the 68-95-99.7 rule, what percentage of students will complete the exam in under an hour?
Mathematics
1 answer:
AnnyKZ [126]3 years ago
7 0

Answer:

Step-by-step explanation:

Given that the  time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes.

P(completing exam before 1 hour)

= P(less than an hour) = P(X<60)

=P(Z<\frac{60-70}{10} =-1)

=0.5-0.34=0.16

i.e. 16% of students completed the standardized exam.

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100 points but please don’t post a very useless answers! &gt;:(
Lelu [443]

Answer:

See below.

Step-by-step explanation:

54.

The radius of the small circles is x.

The radius of the large circle is 2x.

Area of large circle:

πr² = π(2x)² = π4x² = 4πx²

Area of 1 small circle:

πr² = πx²

Area of 2 small circles:

2πx²

shaded area = area of large circle - area of 2 small circles

shaded area = 4πx² - 2πx²

shaded area = 2πx²

57.

The radius if the circle is x√2.

The side of the square is 2x.

Area of circle:

πr² = π(x√2)² = 2πx²

Area of square:

s² = (2x)² = 4x²

shaded area = area of circle - area of square

shaded area = 2πx² - 4x² or (2π - 4)x²

7 0
2 years ago
Carolyn was training for cross-country season on an indoor track. During her workout, she ran 24 laps around a track that measur
ollegr [7]

Answer:

2.64 km

Step-by-step explanation:

24*110=2640 meters

2640/1000=2.64 km

6 0
3 years ago
How do you find the value of n in a geometric progression?​
Bas_tet [7]

A geometric progression is also known as a geometric sequence.

Here is a video explaining how you find the n term value.

https://youtu.be/pwUdYEwT9kY

Hope this helps!

6 0
3 years ago
What’s the approximate value of x?
drek231 [11]

Answer:

Option C: 4

Step-by-step explanation:

<u>Use the Pythagorean Theorem:</u>

a^2+b^2=c^2

3^2+b^2=5^2

9+b^2=25

b^2=16

b=4

Therefore, the value of x is 4.

4 0
2 years ago
Read 2 more answers
Can someone please help me, everyone is taking my points :(
statuscvo [17]

Answer:Yes that is correct, 3(2t + d) is equal to 6t+3d. This is due to the distributive property of multiplication, or as I like to call it, the DPM. The DPM works for all multiplication and praentheses problems. For example, 7(2t+3d)=14t+21d. You multiply the coefficient of the whole parentheses by each number/variable in the equation. Another example is 5(n+s)=5n+5s.

6 0
3 years ago
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