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Rudiy27
3 years ago
15

How do you calculate average time from a data set? These are the times: 2.22s, 2.14s, and 2.10s.

Mathematics
1 answer:
SVETLANKA909090 [29]3 years ago
6 0
You would add them all and then decide them by how many numbers there are witch would be 3.



2.22. 3/6.46 =2.1533
2.14.
+2.10
———
6.46
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The cost of purchasing a bag of rice is partly constant and partly varies inversely as the square root of the number of people d
algol [13]

Answer:

(a) 160 Naira

(b) Undefined

Step-by-step explanation:

Given

Let:

y \to cost of bag of rice

x \to people demanding the bag

So, we have:

y\ = \frac{k}{\sqrt x} + c ---- The variation

y = 100; x = 36

y = 150; x = 144

We have:

y\ = \frac{k}{\sqrt x} + c

When: y = 100; x = 36

100 = \frac{k}{\sqrt {36}} + c

100 = \frac{k}{6} + c -- (1)

When: y = 150; x = 144

150 = \frac{k}{\sqrt {144}} + c

150 = \frac{k}{12} + c--- (2)

Subtract (1) from (2)

150 - 100 = \frac{k}{12} - \frac{k}{6} + c - c

50 = \frac{k}{12} - \frac{k}{6}

Multiply through by 12

600 = k - 2k

600 = -k

k = -600

To solve for x, we have:

100 = \frac{k}{6} + c -- (1)

This gives:

100 = \frac{-600}{6} + c

100 = -100 + c

c = 100 + 100

c = 200

So, the equation is:

y\ = \frac{k}{\sqrt x} + c

y = -\frac{600}{\sqrt x} + 200

Solving (1): y; when x = 225

We have:

y = -\frac{600}{\sqrt x} + 200

y = -\frac{600}{\sqrt {225}} + 200

y = -\frac{600}{15} + 200

y = -40 + 200

y = 160

Solving (2): x; when x = 200

We have:

y = -\frac{600}{\sqrt x} + 200

200 = -\frac{600}{\sqrt x} + 200

Collect like terms

\frac{600}{\sqrt x} = 200 - 200

\frac{600}{\sqrt x} =0

Cross multiply

600 =0 * \sqrt x

600 =0

<em>x is undefined</em>

7 0
3 years ago
Can somebody help me with this ?? :)
NemiM [27]

The answer is C. If the verticle line intersects with the graph more than once, it is NOT a function.

8 0
3 years ago
7^2 + 2 (\sqrt(81)+ \sqrt(42))
lana66690 [7]

Answer:

49 + 246 qrst

Step-by-step explanation:

3 0
3 years ago
What is the measure of angle B in the triangle?
pentagon [3]

Answer: Angle B measures 70 degrees

Step-by-step explanation: One angle is given as 40 while the other two angles are yet unknown.

Remember that the sum of the interior angles in a triangle equals 180 degrees. In other words

Angle A + Angle B + Angle C = 180

Therefore

40 + (2x - 30) + (x + 20) = 180

40 + 2x - 30 + x + 20 = 180

By collecting like terms we have

40 - 30 + 20 + 2x + x = 180

30 + 3x = 180

Subtract 30 from both sides of the equation

3x = 150

Divide both sides of the equation by 3

x = 50

Having calculated x = 50 we can now compute the value of angle B as follows;

When x = 50,

2x - 30 becomes

2(50) - 30

= 100 - 30

= 70.

Angle B measures 70 degrees

8 0
3 years ago
What's the answer to x+5=10
noname [10]
X=5 because you subtract 5 from both sides and then you get x=5 remainding
6 0
3 years ago
Read 2 more answers
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