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Veseljchak [2.6K]
3 years ago
5

In a survey, 31 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped

with a mean of $49 and standard deviation of $8. Find the margin of error at a 80% confidence level. Give your answer to two decimal places.
Mathematics
1 answer:
Andrei [34K]3 years ago
7 0

Answer:

Step-by-step explanation:

i would help you but i dont know , sorry

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using the numbers 5, 8, and 24, create a problem using no more than four operations (addition, subtraction, division, square, sq
irga5000 [103]
 24^2 / (8+5)

576 / 13

= 44.3 
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2 years ago
two adjacent angles of a parallelogram are in the ratio 5:2: . find all the angles of the parallelogram​
kicyunya [14]

<h2>Given :-</h2>

  • Two adjacent angles of a parallelogram are in the ratio of 5 : 2.

<h2>To Find :-</h2>

  • What is the all angles of the parallelogram.
<h3 /><h3 /><h2>Solution :-</h2>

Let, the first angles be 5x

And, the second angles will be 2x

As we know that,

★ Sum of all angles = 180° ★

According to the question by using the formula we get,

  • ⇒ 5x+2x=180°

  • ⇒7x=180°

  • ⇒ \sf x =\: \dfrac{\cancel{180^{\circ}}}{\cancel{7}}

  • ➠ \sf\bold{\red{x =\: 25.7^{\circ}}}

Hence, the required angles are,

  • First angles = 5x = 5(25.7°) = 128.5°
  • Second angles = 2(25.7°) = 51.4°

As we know that, 

opposite angles in a parallelogram

is equal.

∴ The all angles of a parallelogram is 128.5°,51.4°, 128.5° and 51.4°.

6 0
2 years ago
Which algebraic expression is a polynormal
katrin [286]

Answer:

Step-by-step explanation:

Polynomials in one variable are algebraic expressions that consist of terms in the form a x n a x n where n is a non-negative (i.e. positive or zero) integer and a is a real number and is called the coefficient of the term. The degree of a polynomial in one variable is the largest exponent in the polynomial

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3 years ago
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sashaice [31]

Answer:

\frac{5}{7\\} * \frac{3}{3} = \frac{15}{21}

Step-by-step explanation:

To get an equivalent fraction, we multiply by a fraction that is equal to one. The purpose is to alter the denominator of the fraction. To get from a denominator of 7 to 21 we multiply by 3. Therefore we will multiply 5/7 by 3/3 to get the new equivalent fraction with a denominator of 21.

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2 years ago
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Jacob Is Twice as old as Sue. The sum of their ages is 69 years. How old is Jacob?
NemiM [27]
x-Sue\\2x-Jacob\\\\x+2x=69\\\\3x=69\ \ /:3\\\\x=69:3\\\\x=23-Sue\\\\2x=2\cdot23=46-Jacob\\\\Answer:Jacob\ is\ 46.
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