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3 years ago

Is the answer to this problem: A) B) C) D)

Mathematics

2 answers:

Alenkinab [10]3 years ago

8 0

Answer:

Step-by-step explanation:

Ainat [17]3 years ago

3 0

Answer:

Step-by-step explanation:

Rational Numbers: This set is closed under addition, subtraction, multiplication, and division

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Gary Oak is on a mission to complete his Pokedex before Ash Ketchum. To this end, he startssearching the tall grass for Pokemon.

bazaltina [42]

Answer:

Variance Σ i=1 (1 - Pi) /Pi^2

Expected value= π(1/1 + 1/2 .......... 1/n) = π.Hn

Step-by-step explanation:

From the information given, we can get

E(T) = E(t1) + E(t2) ......... +E(tn)

1/P1 + 1/P2.......... 1/Pn

-π/r + π/ r-1 +........... π/1

π(1/1 + 1/2 .......... 1/n)

To find the variance,

Variance= var (x1 + x2......... +xr)

E i=1 var (Xi)

Where,

x1, x2, x3 ........... are all independent of each other.

In case of xi : var (xi) = E(xi^2) - E(xi^2)

Probability of the ith term of coupon that would be observed

Pi = (n - i - 1)/n

Therefore,

i-1 coupons out of a total of n coupons.

To calculate Exi, probability Pi

The expected number of coupons required should be = 1

In probability, 1 - Pi expected number of coupons required E (Xi +1)

E(Xi) = Pi + (1- Pi) E(xi + 1)

E(Xi) = 1/Pi

Due to the above,

E(Xi)^2= Pi + (1- Pi) E(xi + 1)^2

E(Xi)^2= Pi + (1- Pi) E(xi^2 + 1 + 2xi)

E(Xi)^2= 2/Pi^2 - 1/Pi

Var (Xi) = 2/Pi^2 - 1/Pi - 1/Pi^2

= (1 - Pi) /Pi^2

Variance Σ i=1 (1 - Pi) /Pi^2

6 0

3 years ago

A supermarket stock 210 kg of sugar 55% was sold in a week in a week how many kilograms of sugar were left unsold at the end of

Tems11 [23]

55/100 x 210 = 115.5kg were sold in a week
210-115.5=94.5kg left unsold

3 0

3 years ago

Help me out please !!!!!

evablogger [386]

Answer:

Step-by-step explanation:

45+98+x=180

7 0

3 years ago

Read 2 more answers

You and your friend each collect rocks and fossils. Your friend collects three times as many rocks and half as many fossils as y

tino4ka555 [31]

Answer:

Number of rocks and fossils collected by you is 1 and 24 respectively

Number of rocks and fossils collected by your friend is 3 and 12 respectively

Step-by-step explanation:

Let the number of Rocks you collect be x

Let the number of Fossils you collect be y

Then the total number pf objects you collected will be

x + y = 25

x = 25 - y------------------------------(1)

Your friend collects three times as many rocks and half as many fossils as you.

This can be written as

$3x + y(\frac{1}{2}) = 15$

$3x + (\frac{y}{2}) = 15$ -------------------(2)

Substituting (1) in (2)

$3(25 -y) + (\frac{y}{2}) = 15$

$75 - 3y + (\frac{y}{2}) = 15$

Grouping the like terms we get,

$75 - 15 = 3y - (\frac{y}{2})$

$60= \frac{6y-y}{2})$

$60 \times 2= 6y-y$

$120= 5y$

$y = \frac{120}{5}$

y= 24

Substituting y value in equation(1) we get

x = 25 - 24

x= 1

Friends collects 3 times rock

so collects 3x =3(1) = 3rocks

Also he collects half as many fossils

That is

$\frac{y}{2} = \frac{24}{2} =12 fossils$

4 0

4 years ago

This item is $9000 dollar and it is 90% off how much is the item? Step by step?

Daniel [21]

Answer:

The item costs $900 after the 90% off.

Step-by-step explanation:

After the 90% off discount, the item costs (100% - 90%) the cost of the original price.

Hence, $\$9000 \cdot (100\% - 90\%)$

$= \$9000 \cdot 10\%$

$= \$900$

Hope this helped!

5 0

3 years ago

Read 2 more answers