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Natali [406]
3 years ago
8

Larissa asked 40 students to name their favorite food. 10 students said their favorite food was pizza. What percent of the stude

nts Larissa surveyed said their favorite food was pizza?
Mathematics
2 answers:
podryga [215]3 years ago
8 0
4% i think im not completely sure but i did alot of work and i pretty sure thats correct
AfilCa [17]3 years ago
3 0
25% percent 
10/40 is also 1/4 simplified.
1/4 as a fraction is 25%, 25 times 4 equals 100.

<u>OR</u>

Use 1/4, but divide 1 by 4(fraction is also division)
You get 0.25
Turn  this into a percent by moving the decimal point to the right 2 times. 
The answer is 25%
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The pucks used by the National Hockey League for ice hockey must weigh between and ounces. Suppose the weights of pucks produced
Dahasolnce [82]

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P(5.5

And we can find this probability using the normal standard distribution or excel and we got:

P(-2.769

Step-by-step explanation:

For this case we assume the following complete question: "The pucks used by the National Hockey League for ice hockey must weigh between 5.5 and 6 ounces. Suppose the weights of pucks produced at a factory are normally distributed with a mean of 5.86 ounces and a standard deviation of 0.13ounces. What percentage of the pucks produced at this factory cannot be used by the National Hockey League? Round your answer to two decimal places. "

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

Let X the random variable that represent the weights of a population, and for this case we know the distribution for X is given by:

X \sim N(5.86,0.13)  

Where \mu=5.86 and \sigma=0.13

We are interested on this probability

P(5.5

And the best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\sigma}

If we apply this formula to our probability we got this:

P(5.5

And we can find this probability using the normal standard distribution or excel and we got:

P(-2.769

4 0
3 years ago
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