All categories

2 years ago

How to know if a number is proportional

1 answer:

7 0

Ratios are proportional if they represent the same relationship. One way to see if two ratios are proportional is to write them as fractions and then reduce them. If the reduced fractions are the same, your ratios are proportional. To see this process in action, check out this tutorial!

You might be interested in

A half of a class and a half of a student got A on a test. If yet another student got an A, then two-thirds of the class would h

Cerrena [4.2K]

Answer:

Step-by-step explanation:

6 0

3 years ago

Which is a correct step in solving the following equation for g?

OleMash [197]

1. -2g = 1.75 -4
-g = -2.25/2
g = 1.12

8 0

3 years ago

A rectangle has an area of 144x^2-81. What is the length and the width?

Studentka2010 [4]

Answer:

thanks

Step-by-step explanation:

for asking this i need the answer too

6 0

2 years ago

Customers arrivals at a checkout counter in a department store per hour have a Poisson distribution with parameter λ = 7. Calcul

IgorLugansk [536]

Answer:

(1)14.9% (2) 2.96% (3) 97.04%

Step-by-step explanation:

Formula for Poisson distribution: $P(k) = \frac{\lambda^ke^{-k}}{k!}$ where k is a number of guests coming in at a particular hour period.

(1) We can substitute k = 7 and $\lambda = 7$ into the formula:

$P(k=7) = \frac{7^7e^{-7}}{7!}$

$P(k=7) = \frac{823543*0.000911882}{5040} = 0.149 = 14.9\%$

(2)To calculate the probability of maximum 2 customers, we can add up the probability of 0, 1, and 2 customers coming in at a random hours

$P(k\leq2) = P(k=0)+P(k=1)+P(k=2)$

$P(k\leq2) = \frac{7^0e^{-7}}{0!} + \frac{7^1e^{-7}}{1!} + \frac{7^2e^{-7}}{2!}$

$P(k \leq 2) = \frac{0.000911882}{1} + \frac{7*0.000911882}{1} + \frac{49*0.000911882}{2}$

$P(k\leq2) = 0.000911882+0.006383174+0.022341108 \approx 0.0296=2.96\%$

(3) The probability of having at least 3 customers arriving at a random hour would be the probability of having more than 2 customers, which is the invert of probability of having no more than 2 customers. Therefore:

$P(k\geq 3) = P(k>2) = 1 - P(k\leq2) = 1 - 0.0296 = 0.9704 = 97.04\%$

4 0

2 years ago

Emma needs to earn at least $250 a week during her summer break to pay for college. She works two jobs, one at a gas station tha

ANTONII [103]

Answer:

x×25+y×14.5( greater than or equal to symbol)250

4 0

2 years ago