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2 years ago

Can someone please help me!? I will mark them as the Brainly est

Mathematics

2 answers:

lbvjy [14]2 years ago

8 0

The answer is 8/9 / 3 1/5= 5/18

victus00 [196]2 years ago

5 0

Answer:

Your answer is 5/18

Step by step Explanation:

8/9 × 16/5

When we divide it becomes reverse so, 

8/9 × 5/16 = 5/18.

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The following table shows the probability of rolling the numbers 1 through 7

Marysya12 [62]

Answer:

2.0

Step-by-step explanation:

Couldn't really understnd what you wrote but I'll assume it's the standard deviation of a fair, 7-sided die

The standard deviation is just the square root of the variance (which is just the second moment minus the first moment squared)

The first moment (AKA the average is..)

$\frac{1+2+3+4+5+6+7}{7}=4$

The second moment is..

$\frac{1^2+2^2+3^2+4^2+5^2+6^2+7^2}{7}=20$

$\sqrt{20-4^2}=2$

4 0

3 years ago

The life in hours of a 75-watt light bulb is known to be normally distributed with standard deviation σ = 25 hours. A random sam

irina [24]

Answer: a) (1008.34,1019.658) b) (1009.24,1018.76)

Step-by-step explanation:

Since we have given that

n = 75

mean = 1014 hours

Standard deviation = 25 hours

At 95% two sided , z = 1.96

So, confidence interval would be

$\bar{x}\pm z\dfrac{\sigma}{\sqrt{n}}\\\\=1014\pm 1.96\dfrac{25}{\sqrt{75}}\\\\=1014\pm 5.658\\\\=(1014-5.658,1014+5.658)\\\\=(1008.34,1019.658)$

(b) Construct a 95% lower confidence bound on the mean life.

z = 1.65

So, confidence interval would be

$\bar{x}\pm z\times \dfrac{\sigma}{\sqrt{n}}\\\\=1014\pm 1.65\times \dfrac{25}{\sqrt{75}}\\\\=1014\pm 4.76\\\\=(1014-4.76,1014+4.76)\\\\=(1009.24,1018.76)$

Hence, a) (1008.34,1019.658) b) (1009.24,1018.76)

4 0

3 years ago

now has a book that is 3.6 meters long he cuts the Rope into two pieces one piece is 1.925 meters long how long is the other pie

Kamila [148]

The answer is 1.675 because when u subtract 3.6 from 1.925 it gives you 1.675

6 0

3 years ago

Read 2 more answers

Please help and write the steps to fine the answer (ignore the erasings)

podryga [215]

Answer: 1/50

Step-by-step explanation:

= 2 * 10^-2 * 2^0

= 2 * 1/10^2 * 1 (2^0=1)

= 2/100

= 1/50

3 0

3 years ago

Read 2 more answers

PLZ HELP WILL GIVE 30 POINTS AND MARK BRAINLIEST IF ANSWER ARE CORRECT. Thank you! :)

sveticcg [70]

Answer:

3) 2, 3, 4, 5

4) $10

5) B

3 0

3 years ago