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Yakvenalex [24]
3 years ago
15

Spencer bought 3 books of stamps and mailed a package. it cost $4.50 to mail the package. define a variable and write an express

ion to represent the total amount he spent at the post office.
Mathematics
1 answer:
vladimir2022 [97]3 years ago
3 0
X = The cost of each book of stamps

There for your expression would be:
3x + 4.50

3x is 3 book of stamps times x cost of each book.
Your 4.50 is your one time fee to mail the package.

Hope this helps! (:
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For the second blank, you must subtract the number collected from the number that was the goal for the class.
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8 0
3 years ago
Find the expected value of the winnings from a game that has the following payout probability distribution: Skip Payout ($) 1 2
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$4.35

Step-by-step explanation:

The expected value of a random variable <em>X</em>, often denoted as E(<em>X</em>), indicates the probability-weighted average of all possible values/events. The general formula of expected value is

\mathrm{E(\textit X \mathrm)} = \displaystyle\sum_{\mathclap{i=1}}^{k} \ X \times P(X) \\ \\ \\ = X_{1} \times P(X_{1}) \ + \ X_{2} \times P(X_{2}) \ + \ X_{3} \times P(X_{3}) + \ \cdots \ + X_{k} \times P(X_{k}).

Therefore, the expected value of the winnings from a game is

\mathrm{E(\textit X \mathrm)} \ = \ 1 \times 0.35 \ + \ 2 \times 0.2 \ + \ 5 \times 0.1 + \ 8 \times 0.2 \ + 10 \times 0.15 \\ \\ = \ 4.35 \ \ (\mathrm{nearest \ hundredth}).

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2 years ago
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