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3 years ago

Eight less than one-fourth of a number is 4

Mathematics

2 answers:

Troyanec [42]3 years ago

8 0

1/4x-8=4
+8. +8
1/4x = 12
/ 1/4. / 1/4
X = No problem. 48

Triss [41]3 years ago

3 0

4+8=12, 12*4=48. the answer should be 48.

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Although bats are not known for their eyesight, they are able to locate prey (mainly insects) by emitting high-pitched sounds an

Sergeu [11.5K]

Answer:

$Mean = 48.6364$

$s^2 = 331.8545$ -- Sample Variance

$s = 18.2169$ --- Sample Standard Deviation

Step-by-step explanation:

Given

$n = 11$

$Data: 24, 41 ,25 ,68 ,53 ,83 ,43 ,63 ,56 ,34 ,45$

Solving (a): The sample mean

$Mean = \frac{\sum x}{n}$

So:

$Mean = \frac{24 +41 +25 +68 +53 +83 +43 +63 +56 +34+ 45}{11}$

$Mean = \frac{535}{11}$

$Mean = 48.6364$

Solving (b): Sample variance (s^2)

This is calculated as:

$s^2 = \frac{\sum (x - \bar x_i)^2}{n - 1}$

Where:

$\bar x = 48.6364$

So:

$s^2 = \frac{(24 -48.6364)^2 +(41 -48.6364)^2 +......................+( 45 -48.6364)^2}{11-1}$

$s^2 = \frac{3318.54545456}{10}$

$s^2 = 331.8545$

Solving (c): Sample Standard Deviation (s)

This is calculated as:

$s = \sqrt {s^2$

$s = \sqrt{331.8545$

$s = 18.2169$

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3 years ago

While shopping this week I misread my shopping list and bought 5 bread and 2 milk. I got a refund and bought 2 bread and 5 milk.

user100 [1]

Suppose x is the total cost for the first purchase, cost of the bread = b and cost of the milk = m
Then:-
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4 years ago

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Nataliya [291]

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3 years ago

Katrina is asked to simplify the expression Negative 3 a minus 4 b minus 2 (5 a minus 7 b).

lara31 [8.8K]

Answer:

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Step-by-step explanation:

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3 years ago

96 16 81 = x 11 15 18 = y what is the value of y-2x?

qwelly [4]

Hey, im not really sure but i think it is that 1. x=96 y=11 2. x=16 y=15 3.x=81 y=18
Then you just substitute the numbers into the letters. For example,

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3 years ago