2 years ago

Who can help me out with this question please

Mathematics

1 answer:

lapo4ka [179]2 years ago

7 0

There are 14 total marbles

8 red

6 blue

Hopefully that helps answer your question some

You might be interested in

I need help fining X. I keep getting a negative number

KIM [24]

Answer:

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

After observing this pattern, Felipe made a conjecture for the next number in the pattern.

lys-0071 [83]

The next number in this pattern should be A)28

3 0

3 years ago

Read 2 more answers

Sarah bought a TV for $250. Three years later she sold it for $180. Work out her percentage loss.

Anna71 [15]

70/250 x 100
Answer: 28%

3 0

2 years ago

50 points! Mhanifa please help me

Nikolay [14]

Answer:

1) x=8, y=138

2) x=110

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

An article in Knee Surgery, Sports Traumatology, Arthroscopy, "Arthroscopic meniscal repair with an absorbable screw: results an

igomit [66]

Answer:

Mean = 1.57

Variance=0.31

Step-by-step explanation:

To calculate the mean and the variance of the number of successful surgeries (X), we first have to enumerate the possible outcomes:

1) Both surgeries are successful (X=2).

$P(e_1)=0.90*0.67=0.603$

2) Left knee unsuccessful and right knee successful (X=1).

$P(e_2)=(1-0.9)*0.67=0.1*0.67=0.067$

3) Right knee unsuccessful and left knee successful (X=1).

$P(e_3)=0.90*(1-0.67)=0.9*0.33=0.297$

4) Both surgeries are unsuccessful (X=0).

$P(e_4)=(1-0.90)*(1-0.67)=0.1*0.33=0.033$

Then, the mean can be calculated as the expected value:

$M=\sum p_iX_i=0.603*2+0.067*1+0.297*1+0.033*0\\\\M=1.206+0.067+0.297+0\\\\M=1.57$

The variance can be calculated as:

$V=\sum p_i(X_i-\bar{X})^2\\\\V=0.603(2-1.57)^2+(0.067+0.297)*(1-1.57)^2+0.033*(0-1.57)^2\\\\V=0.603*0.1849+0.364*0.3249+0.033*2.4649\\\\V=0.1115+0.1183+0.0813\\\\V=0.3111$

3 0

3 years ago