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4vir4ik [10]
3 years ago
13

ANSWER PLEASE!!! A company sells hockey sticks. Members of the company's research group would like to estimate the percentage of

their customers who are left-handed. They plan to survey a sample of customers.
Which method should the members use to select the sample?

randomly select 45 customers from a list of all customers

select the next 45 customers who place an order and are left-handed

randomly select 45 customers from a list of customers who have purchased left-handed hockey sticks

select the next 45 customers who place an order
Mathematics
2 answers:
nataly862011 [7]3 years ago
7 0
I think it is A it's definitely not C because that means it would be bias.
aalyn [17]3 years ago
3 0

Answer:

A. Randomly select 45 customers from a list of all customers

Step-by-step explanation:

We are given that,

The company wants to estimate the percentage of the customers who are left-handed.

In order to find the probability of an event,

We find the ratio of number of favorable events from a random sample to the total number of events.

<em>So, we have to find the number of customers who are left-handed from a random sample and find the percentage.</em>

Thus, the best method to select the sample would be,

<h3>A. Randomly select 45 customers from a list of all customers</h3>
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3 years ago
Write an equation for a parabola that has a vertex (1, 2) and passes through the point (3, -6).
Alex

Answer:

y= -2x²+4x.

Step-by-step explanation:

the common equation of the parabola is y=ax²+bx+c, where a, b, c - numbers.

1) the coordinates of the vertex are:

x_0=-\frac{b}{2a} \ and \ y_0=\frac{4ac-b^2}{4a}.

2) if according to the condition x₀=1, then b= -2a.

If according to the condition y₀=2, then   2=\frac{4ac-b^2}{4a}=\frac{4ac-4a^2}{4a}=c-a;

it means that c=a+2.

3) if b= -2a; c=a+2 and the point (3;-6) belongs to the given parabola, then it is possible to substitute them into the common equation of the parabola:

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4) if a= -2, then b=-2a=4, and c=a+2=0.

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6 0
3 years ago
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Pani-rosa [81]

Answer:

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elena55 [62]

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The fractions have unlike denominators. First, find the Least Common Denominator and rewrite the fractions with the common denominator. Multiply both the numerator and denominator of each fraction by the number that makes its denominator equal the LCD. This is basically multiplying each fraction by 1. The two fractions now have like denominators so you can subtract the numerators.

This fraction cannot be reduced.

Therefore the answer is 11/24

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3 years ago
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