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3 years ago

Of 30 students 1/3 play sports of those students 2/5 play soccer, how many students play soccer

Mathematics

2 answers:

Natasha2012 [34]3 years ago

4 0

4 students play soccer.

Rephrased:
2/3 of 1/3 of 30 total students play soccer.

Solution:
1/3×30=10
2/5×10=4

solmaris [256]3 years ago

3 0

Answer:

Answer is 4

Step-by-step explanation:

Given that there are in total 30 students.

Out of these 30 student, only $\frac{1}{3}$

play sports.

i.e. no of students playing sports = 10

Out of these 10, only $\frac{2}{5}$ play soccer

Hence number of students playing soccer = 2/5(10) = 4

Answer is 4

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Delta makes 12-volt car batteries. These batteries are known to be normally

blondinia [14]

Answer:

The probability that Delta car batteries last between three and four years

P(36≤X≤48) = 0.5188

The percentage of that Delta car batteries last between three and four years

P(3≤X≤4) = 52%

Step-by-step explanation:

Step(i):-

Given that the sample size n =12 -volt car batteries

Let 'X' be a Random variable in a normal distribution

Given that mean of the normal distribution = 45 months

Given that the Standard deviation of the normal distribution = 8months

Step(ii):-

Let X₁ = 3 years = 12 × 3 = 36 months

$Z_{1} = \frac{x_{1} -mean}{S.D} = \frac{36-45}{8} = -1.125$

Let X₂ = 4 years = 12 × 4 = 48 months

$Z_{2} = \frac{x_{2} -mean}{S.D} = \frac{48-45}{8} = 0.375$

Step(iii):-

The probability that Delta car batteries last between three and four years

P(36≤X≤48) = P(-1.125≤Z≤0.375)

= P(Z≤0.375) - P(Z≤-1.125)

= 0.5 +A(0.375) - (0.5-A(1.125)

= 0.5 + 0.1480 - (0.5 -0.3708)

= 0.1480 + 0.3708

= 0.5188

Final answer:-

The probability that Delta car batteries last between three and four years

P(36≤X≤48) = 0.5188

The percentage of that Delta car batteries last between three and four years

P(3≤X≤4) = 52%

5 0

3 years ago

Joey is running an experiment with a mass on a spring. Joey models the height of the mass above the table he is working on using

galben [10]

Answer: 1.8 s

Step-by-step explanation:

Given

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$\therefore T=\dfrac{2\pi }{\omega}$

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5 0

3 years ago

What is 55 rounded by 2 of the nearest hundred

Lelu [443]

It would be 100. Because let's say you had to round 25 to the nearest 10 it would be 30 because everything ending with 5 (example: 5 to nearest 10 would go to 10 65 to the nearest ten would go to 70) but anything lower then 5 goes to the lower number.

8 0

4 years ago

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PLEASE HELP ME Describe the sequence in words: 5,9,13,17,21...

Nady [450]

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3 years ago

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DedPeter [7]

Answer:

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3 years ago