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ryzh [129]
4 years ago
9

One dozen students each drop a brass tack six times from a height of six inches onto a level hard surface. They record the numbe

r of times the tack lands point up. The table below lists their results.
What was the experimental probability that the tack lands point-up for student 4?

Mathematics
1 answer:
pshichka [43]4 years ago
8 0

Experimental Probability = 2/3

To find the experimental probability that the tack lands point-up for student 4, we can use the following equation

\frac{Point-up}{Attempts}\\\frac{4}{6} or\frac{2}{3}

If this helped you a Brainliest would be appreciated!

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Multiply 5/12 by the reciprocal of 10/6
kumpel [21]

Answer:

1/2

Step-by-step explanation:

reciprocal is an inversion of a number.

Therefore the reciprocal of 10/6 is 6/10.

Therefore, the solution would be 5/12(6/10)

Which is 1/2

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4 years ago
A telemarketer makes a sale on 25% of his calls. If he makes 300 calls in a night, what is the probability that he will make mor
Nina [5.8K]

Answer: 0.7258

Step-by-step explanation:

Given : A telemarketer makes a sale on 25% of his calls.

i.e. p=0.25

He makes 300 calls in a night, i.e. n=300

Let x be a random variable that represents the number of calls make in night.

To convert the given binomial distribution to normal distribution we have :-

\mu=np=300(0.25)=75

\sigma=\sqrt{p(1-p)n}=\sqrt{(0.25)(1-0.25)(300)}\\\\=\sqrt{56.25}=7.5

Now, using z=\dfrac{x-\mu}{\sigma}, the z-value corresponds to x= 70 :-

z=\dfrac{70-75}{7.5}\approx-0.67

The z-value corresponds to x= 90 :-

z=\dfrac{90-75}{7.5}\approx2

By using the standard normal distribution table for z, the probability that he will make more than 70 sales but less than 90 sales:-

P(-0.67

Hence, the probability that he will make more than 70 sales but less than 90 sales= 0.7258

6 0
4 years ago
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