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Hunter-Best [27]
3 years ago
7

How do you do these questions?

Mathematics
1 answer:
Tanzania [10]3 years ago
3 0

Answer:

μ ≈ 2.33

σ ≈ 1.25

Step-by-step explanation:

Each person has equal probability of ⅓.

\left[\begin{array}{cc}X&P(X)\\1&\frac{1}{3}\\2&\frac{1}{3}\\4&\frac{1}{3}\end{array}\right]

The mean is the expected value:

μ = E(X) = ∑ X P(X)

μ = (1) (⅓) + (2) (⅓) + (4) (⅓)

μ = ⁷/₃

The standard deviation is:

σ² = ∑ (X−μ)² P(X)

σ² = (1 − ⁷/₃)² (⅓) + (2 − ⁷/₃)² (⅓) + (4 − ⁷/₃)² (⅓)

σ² = ¹⁴/₉

σ ≈ 1.25

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One small airplane has 44 seats. The flight crew sits in two of these seats. The remaining seats are divided equally into 7 rows
Amiraneli [1.4K]

The number of seats in each row is an illustration of mathematical expressions.

  • <em>The numerical expression for the number of seats in each row is: </em>\mathbf{\frac{44 - 2}{7}}<em />
  • <em>The number of seats in each row would be 6</em>

The given parameters are:

\mathbf{Total\ Seats = 44}

\mathbf{Flight\ Crew = 2}

\mathbf{Rows = 7}

So, the remaining seat is calculated as:

\mathbf{Remaining = Total\ Seats - Flight\ Crew }

Substitute known values

\mathbf{Remaining = 44 - 2}

The number of seat in each row is calculated as:

\mathbf{Seats = \frac{Remaining}{Rows}}

Substitute known values

\mathbf{Seats = \frac{44 - 2}{7}}

Hence, the numerical expression for the number of seats in each row is:

\mathbf{\frac{44 - 2}{7}}

When the expression is solved, the number of seats in each row would be 6

Read more about numerical expressions at:

brainly.com/question/4884465

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1 year ago
6. It's Not B
stiv31 [10]
The answer would be D.
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2 years ago
The perimeter of a rectangle olis 40 inches. If the length of the rectangle is 13 inches, which equation could be used to find t
Elis [28]
The perimeter of a rectangle olis 40 inches. If the length of the rectangle is 13 inches, which equation could be used to find the width of x

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Find the volume of a rectangular prism with a length of 13.2 in, a width of 13.8 in and
belka [17]

Answer:

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5 0
3 years ago
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iven: C is a point on the perpendicular bisector, l, of AB. Prove: AC = BC Use the drop-down menus to complete the proof. By the
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Answer:

See the attached figure for better explanation :

Step-by-step explanation :

1. By the unique line postulate, you can draw only one line segment : <u>BC</u>

Since only one line can be drawn between two distinct points.

2. Using the definition of <u>reflection</u>, reflect BC over l.

To find line segment which reflects BC over l, we will use the definition of reflection.

3. By the definition of reflection, C is the image of itself and <u>A</u> is the image of B.

Definition of reflection says the figure about a line is transformed to form the mirror image. Now, CD is perpendicular bisector of AB so A and B are equidistant from D forming the mirror image of each other.

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In Reflection the figure is transformed to form a mirror image, Hence the length will be preserved in case of reflection.

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3 years ago
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