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2 years ago

After paying $4.76 for a sandwich, Michelle has $16.88. How much money did she start with?

Mathematics

2 answers:

Sever21 [200]2 years ago

7 0

Answer:

$21.64

Step-by-step explanation:

original amount = spent + remaining

original amount = 4.76 + 16.88

= $21.64

vitfil [10]2 years ago

3 0

Answer:

Michelle started with $21.64.

Step-by-step explanation:

To solve this problem, we simply need to <em>add </em>he current price, or $16.88, to the amount she <em>spent</em>, or $4.76.

16.88 + 4.76 = $21.64

Therefore, Michelle started with $21.64.

Hope this helps! :D

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3 years ago

Calculate the sample mean and sample variance for the following frequency distribution of heart rates for a sample of American a

spin [16.1K]

Answer:

$Mean = 68.9$

$s^2 =18.1$ --- Variance

Step-by-step explanation:

Given

$\begin{array}{cccccc}{Class} & {51-58} & {59-66} & {67-74} & {75-82} & {83-90} \ \\ {Frequency} & {6} & {3} & {11} & {13} & {4} \ \end{array}$

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For 59 - 66

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For 67 - 74

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$x = \frac{1}{2}(75+82) = \frac{1}{2}(157) = 78.5$

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$x = \frac{1}{2}(83+90) = \frac{1}{2}(173) = 86.5$

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$\begin{array}{cccccc}{x} & {54.5} & {62.5} & {70.5} & {78.5} & {86.5} \ \\ {Frequency} & {6} & {3} & {11} & {13} & {4} \ \end{array}$

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$Mean = \frac{\sum fx}{\sum f}$

$Mean = \frac{54.5*4+62.5*3+70.5*11+78.5*13+86.5*4}{6+3+11+13+4}$

$Mean = \frac{2547.5}{37}$

$Mean = 68.9$ -- approximated

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This is calculated as:

$s^2 =\frac{\sum (x - \overline x)^2}{\sum f - 1}$

So, we have:

$s^2 =\frac{(54.5-68.9)^2+(62.5-68.9)^2+(70.5-68.9)^2+(78.5-68.9)^2+(86.5-68.9)^2}{37 - 1}$

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2 years ago

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Answer:

Step-by-step explanation:

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