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3 years ago

13

Every 2 days a scientist spends 1.25 hours observing dolphins and 3.5 hours observing sea lions. At this rate, how many total ho

urs will the scientist spend observing dolphins and sea lions in 6 days?

1 answer:

dangina [55]3 years ago

8 0

The scientist would spend 14.25 hours observing dolphins and sea lions in 6 days.

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1. A weighted coin is biased so that a head is twice as likely to occur as a tail. If the coin is tossed 4 times, what is the pr

ohaa [14]

Answer:

80/81

Step-by-step explanation:

If a head is twice as likely to occur as a tail, then the probability of getting heads is 2/3 and the probability of getting tails is 1/3.

The probability of getting at least 1 head involves 4 scenarios:

1) 1 Head and 3 Tails

2) 2 Heads and 2 Tails

3) 3 Heads and 1 Tail

4) 4 Heads

Instead of calculate all these scenarios, you could calculate the opposite scenario: 4 Tails. The sum of all possible scenarios is 1, so:

P(at least one head) + P(no heads) = 1

Then, P(at least one head) = 1 - P(no heads)

The probability of 4 tails is:

P(no heads) = P(TTTT) = (1/3)(1/3)(1/3)(1/3)=1/81

Then, P(at least one head) = 1 - 1/81=80/81

7 0

3 years ago

Estimate 1189-597. Show your working.

iren2701 [21]

Answer:

400

Step-by-step explanation:

1189 becomes 1000

597 becomes 600

therefore 1000-600= 400

I am not sure so please let me know

3 0

3 years ago

To determine what percentage of 376 teachers at a university were female, Ryan randomly selected 14 teachers. He then collected

Kipish [7]

Answer:

a)There are 14 teachers in Ryan's sample, and 362 teachers in the population.

Step-by-step explanation:

<u> Population:-</u>

<em>The totality of observations with which we are concerned, whether this number be finite or infinite is called population.</em>

<em>Given data population is 376 teachers at a university were female'</em>

<u><em>Sample:-</em></u>

A sample is a subset of a Population

sample of given data = 14teachers

The percentage of 376 teachers at a university were female, Ryan randomly selected 14 teachers.

<em /> $p = \frac{14}{376} = 0.0372$ <em> = 3.72%</em>

6 0

4 years ago

May I have some help?

Sholpan [36]

Answer:

0 ÷ 3 = 0

Step-by-step explanation:

if x = 0 you put it in where the x is

8 0

3 years ago

Given the function below, what value will result in f(x)=10?<br> f(x)=1/2x+8

nignag [31]

10 = 1/2x + 8
2 = 1/2x
X = 4

5 0

3 years ago

Read 2 more answers