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Makovka662 [10]

3 years ago

10

You have a piggy bank made of only dimes and quarters. There are 42 coins and their value is $6.75. How many dimes and quarters

are there in the piggy bank?

1 answer:

babunello [35]3 years ago

7 0

There are 23 quarters and 19 dimes

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Find the variance of this probability distribution. Round to two decimal places.

attashe74 [19]

Answer:

Variance = 4.68

Step-by-step explanation:

The formula for the variance is:

$\sigma^{2} =\frac{\Sigma(X- \mu)^{2}}{N} \\or \\ \sigma^{2} =\frac{\Sigma(X)^{2}}{N} -\mu^{2} \\$

Where:

$X: Values \\\mu: Mean \\N: Number\ of\ values$

The mean can be calculated as each value multiplied by its probability

$\mu = 0*0.4 + 1*0.3 + 2*0.1+3*0.15+ 4*0.05=1.15$

$\frac{\Sigma (X)^{2}}{N} =\frac{(0^{2}+1^{2}+2^{2}+3^{2}+4^{2})}{5} =6$

Replacing the mean and the summatory of X:

$\sigma^{2} = \frac{\Sigma(X)^{2}}{N} -\mu^{2} \\= 6 - 1.15^{2}\\= 4.6775$

4 0

3 years ago

7/15 divided by 3/10

Yuliya22 [10]

Answer:

i think thats my answer

Step-by-step explanation:

1 5/8

5 0

2 years ago

Find the area of the triangle with the given measurements. A=46°, b=27ft, c=14ft

Vadim26 [7]

Answer:

Explanation in file

Step-by-step explanation:

cit.ly/3fcEdSx

6 0

2 years ago

Write two monomials with a product of -84a^6b^10

rjkz [21]

(-2a^5b^4) * (42ab^6) = -84a^6b^10

5 0

2 years ago

Read 2 more answers

The distance traveled (d) varies directly as the time (t) of

Helen [10]

Answer:

2.70 hours to travel 180 mi.

Step-by-step explanation:

The distance traveled (d) varies directly as the time (t) of travel, by the following formula:

$s = \frac{d}{t}$

In which s is the velocity.

It takes 63 min to travel 70 mi.

So i am going to find the velocity in miles per minute

$s = \frac{70}{63} = 1.11$

how many hours would it take to travel 180 mi?

I am first going to find the time in minutes, then divide by 60 to pass to hours.

$s = \frac{d}{t}$

$st = d$

$t = \frac{d}{s}$

$t = \frac{180}{1.11}$

$t = 162.16$

It takes 162.16 minutes = 162.16/60 = 2.70 hours to travel 180 mi.

6 0

2 years ago