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3 years ago

Need help on #7 help if u know how to solve thanks!

Mathematics

2 answers:

mash [69]3 years ago

8 0

7a) 302.5
7b) 302500
Hope this helps! :)

Elanso [62]3 years ago

8 0

This is a great method
I call it dot traveling
if you have 3.025 and 100 has 2 zeros you move your dot by 2 spaces so 302.5
next
if you have 10^5 you will need to look only at the five (note: this is ONLY on the number 10)
so we are going to move 3.025 by 5 spaces
notice how it doesnt have enough space? Add zeros!
So here 3.025 * 10^5 = 302500!
Hope I helped

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Answer:

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3 years ago

An elementary school is offering 3 language classes: one in Spanish, one in French,and one in German. The classes are open to an

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Answer:

A. 0.5

B. 0.32

C. 0.75

Step-by-step explanation:

There are

28 students in the Spanish class,
26 in the French class,
16 in the German class,
12 students that are in both Spanish and French,
4 that are in both Spanish and German,
6 that are in both French and German,
2 students taking all 3 classes.

So,

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4 - 2 = 2 students are in Spanish and German, but are not in French,
12 - 2 = 10 students are in Spanish and French but are not in German,
16 - 2 - 4 - 2 = 8 students are only in German,
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28 - 2 - 2 - 10 = 14 students are only in Spanish.

In total, there are

2 + 4 + 2 + 10 + 8 + 10 +14 = 50 students.

The classes are open to any of the 100 students in the school, so

100 - 50 = 50 students are not in any of the languages classes.

A. If a student is chosen randomly, the probability that he or she is not in any of the language classes is

$\dfrac{50}{100} =0.5$

B. If a student is chosen randomly, the probability that he or she is taking exactly one language class is

$\dfrac{8+10+14}{100}=0.32$

C. If 2 students are chosen randomly, the probability that both are not taking any language classes is

$0.5\cdot 0.5=0.25$

So, the probability that at least 1 is taking a language class is

$1-0.25=0.75$

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