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IRISSAK [1]
3 years ago
13

Britney just got a new video game for her birthday. Yesterday, she played for 27 minutes and beat 3 levels. Today, her parents s

aid she can play for 45 minutes. If she beats levels at the same rate, how many levels should Britney beat today?
Mathematics
1 answer:
Tom [10]3 years ago
8 0

Answer:

5 levels

Step-by-step explanation:

To know the rate of her beating levels yesterday, divide the # of minutes she played (27 minutes) to the # of levels she beat (3 levels).

  • 27 ÷ 3 = 9

So she played for 9 minutes to beat a single level.

Since she will try to beat levels the same rate as yesterday, you will have to divide the #of minutes her parents let her play (45 minutes) to yesterday's rate (9 minutes per level).

  • 45 ÷ 9 = 5

Britney should beat 5 levels today if she wants to beat levels at the same rate as yesterday's.

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Soloha48 [4]

Answer:

Are the events A and B disjoint? Yes

Step-by-step explanation:

Disjoint events are those events that cannot occur at the same time, i.e. for events <em>X</em> and <em>Y</em> to be disjoint, P(X\cap Y)=0.

The event <em>A</em> is defined as the number of students whose age is at most 32.

And event <em>B</em> is defined as the number of students whose age is at least 37.

The events <em>A</em> and <em>B</em> are disjoint events.

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The sample space for the intersection of these two events is:

Sample space of (<em>A</em> ∩ <em>B</em>) = 0

As there are no common terms in both the sample.

Hence proved, events <em>A </em> and <em>B</em> are disjoint.

3 0
3 years ago
consider a population of voters. suppose that that there are n=1000 voters in the population, 30% of whom favor jones. identify
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Answer:

P(B)=0.30

Step-by-step explanation:

Out of 1000 Voters, 30% favor Jones.

Event S=Favors Jones on First Trial

Event B=S occurs on Second Trial

P(S)=0.30

P(S')=1-0.30=0.70

Event B could occur in two ways

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Therefore,

P(B)=P(SS)+P(S'S)

=(0.3X0.3)+(0.7X0.3)

=0.09+0.21

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Therefore, the probability of event B(that event S occurs on the second trial), P(B)=0.30.

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