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2 years ago

() Fill in the missing number

Mathematics

2 answers:

Naddika [18.5K]2 years ago

7 0

The answer is x because x is the unknown i have defined for this unknown equation.

arlik [135]2 years ago

3 0

Answer:

Step-by-step explanation:

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konstantin123 [22]

Answer:

5. D

6.D

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3 years ago

How to tell if a number is prime or composite

kobusy [5.1K]

A prime number has only two factors: 1 and itself. Acomposite number has more than two factors. Thenumber 1 is neither prime nor composite. The prime numbers between 2 and 31 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 and 31 since each of these numbers has only two factors, itself and 1.

7 0

3 years ago

Read 2 more answers

Suppose that the length of a phone call in minutes is an exponential random variable with parameter λ = 1/ 8. If someone arrives

Elis [28]

Answer:

a) P=0.535

b) P=0.204

c) P=0.286

Step-by-step explanation:

The exponential distribution is expressed as

$F(x>t)=e^{-\lambda t}$

In this example, λ=1/8=0.125 min⁻¹.

a) The probability of having to wait more than 5 minutes

$F(x>5)=e^{-0.125*5}=e^{-0.625}=0.535$

b) The probability of having to wait between 10 and 20 minutes

$F(1020)=e^{-0.125*10}-e^{-0.125*20}\\\\F(10$

c) The exponential distribution is memory-less, so it is independent of past events.

If you have waited 5 minutes, the probability of waiting more than 15 minutes in total is the same as the probability of waiting 15-5=10 minutes.

$F(x>15|t^*=5)=F(x>15)/F(x>5)=\frac{e^{-0.125*15}}{e^{-0.125*5}}=e^{-0.125*(15-5)}\\\\ F(x>15|t^*=5)=e^{-0.125*(10)}=F(x>10)=0.286$

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3 years ago

marissa wants to purchase song for hee ipod songs on itunes cost $1.25 each marisa found anothee webside called mp3 golore that

prisoha [69]

The equaton for cost is

first website is 1.25x
2nd is x+3

I'm assuming what number of songs wil make them have same cos
1.25x=x+3
minus x from both sides
0.25x=3
divide both sides by 0.25
x=12
answer is 12 songs must be purchased to spend the same on each website

8 0

3 years ago

A computer professor is interested in studying the amount of time it would take students enrolled in the Introduction to Compute

inysia [295]

Answer:

Following are the solution to the given question:

Step-by-step explanation:

In this question, firstly we calculating the $\bar{x} \ \ and \ \ s$