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OLEGan [10]
2 years ago
7

What is the length of the arc that subtends a central angle of 139°, for a circle with a radius of 7.5 centimeters? Use 3.14 for

π when necessary
Mathematics
2 answers:
eduard2 years ago
7 0
18.19 139/360=x/diameter 
ANTONII [103]2 years ago
7 0

Answer:

18.18583 cm

Step-by-step explanation:

As per circle arc theorem we have

arc length s = Central angle* perimeter of the circle / 360

Here given that radius = 7.5 cm

Hence circumference = 2 (3.14)(7.5) = 47.1 cm

Central angle / 360 = 139/360 = 0.3861111

Hence arc length = 0.3861111*47.1 = 18.18583 cm

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2 years ago
In a statistics mid-term exam graded out of 100 points, the distribution of the exam scores was bi-modal with a mean of 70 point
Mnenie [13.5K]

Answer:

Step-by-step explanation:

Assuming a normal distribution for the distribution of the points scored by students in the exam, the formula for normal distribution is expressed as

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s = standard deviation

From the information given,

u = 70 points

s = 10.

We want to find the probability of students scored between 40 points and 100 points. It is expressed as

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For x = 40,

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Looking at the normal distribution table, the corresponding z score is 0.0135

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Looking at the normal distribution table, the corresponding z score is 0.99865

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4 0
3 years ago
Read 2 more answers
What is the answer?<br> (2 3/8 - 1/4)x1/8=?
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