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3 years ago

Help Me Please................(4)

Mathematics

1 answer:

weqwewe [10]3 years ago

5 0

Answer:

n= -13/10

Step-by-step explanation:

-n= -7/10+2

-n= 13/10

n= -13/10

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37 chairs and 6 tables if The same number of chairs is placed at each table how many chairs can be placed at each table

Evgen [1.6K]

Answer: 6 per table and 1 chair remaining

Step-by-step explanation:

4 0

3 years ago

In a sale there is 25% off all prices. A chair costs Â£45 in the sale. How much was it before the sale?

garri49 [273]

Answer:

60 pounds

Step-by-step explanation:

Let the normal price be p. The "25%-off" sale price is then 0.75p, and this 0.75p equals 45 pounds. Dividing both sides by 0.75 results in p = 60 pounds.

3 0

3 years ago

A manager at a local company asked his employees how many times they had given blood in the last year. The results of the survey

Lubov Fominskaja [6]

Answer:

$Var(X) = E(X^2) -[E(X)]^2 = 4.97 -(1.61)^2 =2.3779$

And the deviation would be:

$Sd(X) =\sqrt{2.3779}= 1.542 \approx 1.54$

Step-by-step explanation:

For this case we have the following distribution given:

X 0 1 2 3 4 5 6

P(X) 0.3 0.25 0.2 0.12 0.07 0.04 0.02

For this case we need to find first the expected value given by:

$E(X) = \sum_{i=1}^n X_i P(X_I)$

And replacing we got:

$E(X)= 0*0.3 +1*0.25 +2*0.2 +3*0.12 +4*0.07+ 5*0.04 +6*0.02=1.61$

Now we can find the second moment given by:

$E(X^2) =\sum_{i=1}^n X^2_i P(X_i)$

And replacing we got:

$E(X^2)= 0^2*0.3 +1^2*0.25 +2^2*0.2 +3^2*0.12 +4^2*0.07+ 5^2*0.04 +6^2*0.02=4.97$

And the variance would be given by:

$Var(X) = E(X^2) -[E(X)]^2 = 4.97 -(1.61)^2 =2.3779$

And the deviation would be:

$Sd(X) =\sqrt{2.3779}= 1.542 \approx 1.54$

8 0

4 years ago

Help me wick show you work

expeople1 [14]

3 to 9 clouds are smiley faces Explaintion- hope it’s right

3 0

3 years ago

Read 2 more answers

I need the awnser ASAP plz!!

Ganezh [65]

Answer:

it is D

Step-by-step explanation:

the ratio is 1.5 so multiply 15 by 1.5

3 0

3 years ago