To make things easier, pretend she has 100 marbles and halve everything except for the percentages (everything will be doubled later).
If 22% of her marbles are navy, then 22 marbles are navy.
If 40 (half of 80) her marbles are royal blue, then 40% of her marbles are royal blue.
If 38% are baby blue, she has 38 baby blue marbles.
How many cobalt blue marbles does she have? Well, 22+40+38=100
Since we added the percentages, the ratio would be the same whether she has 100 or 200 marbles.
Since the percentages of navy, royal blue, and baby blue added up to 100%, she has no cobalt blue marbles.
Hope this helps! feel free to clarify
The height of Corbin's model given the actual height of the monument and the scale of the model is 6.04 inches.
<h3>What is the height of the model?</h3>
A scale model is smaller representation of a bigger object / drawing. The scale model is reduced by constant dimensions.
The height of Corbin's model = 604 / 100 = 6.04 inches
To learn more about scale models, please check: brainly.com/question/20213755
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Answer:
We accept H₀ . We don´t have enough evidence to express the publisher claim is not true
Step by Step explanation:
We must evaluate if the mean of the price of college textbooks is different from the value claimed by the publisher
n < 30 then we must use t - distrbution
degree of freedom n - 1 df = 22 - 1 df = 21
As the question mentions " different " that means, a two-tail test
At 0,01 significance level α = 0,01 α/2 = 0,005
and t(c) = 2,831
Test Hypothesis
Null Hypothesis H₀ μ = μ₀
Alternative hypothesis Hₐ μ ≠ μ₀
To calculate t(s)
t(s) = ( μ - μ₀ ) /σ/√n
t(s) = ( 433,50 - 385 ) / 86,92 / √22
t(s) = 2,6171
Comparing t(c) and t(s)
t(s) < t(c)
Then t(s) is in the acceptance region we accept H₀. We don´t have enough evidence to claim that mean price differs from publisher claim
Answer:
see below
Step-by-step explanation:
Closed under addition, subtraction and multiplication
Not closed under division :-
for example 3/4 = 0.75 which is not an integer
