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LUCKY_DIMON [66]

3 years ago

5

A bag has 4 yellow, 6 red, 2 green, and 8 purple marbles . What is the probability of picking a purple marble, replacing it, and

then picking another purple marble

2 answers:

Brut [27]3 years ago

8 0

The probability is 7/19

Ostrovityanka [42]3 years ago

3 0

7/19 is the answer because your replacing the purple marble and it became 7 all u do is add them

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Plz help I will give brainliest

WARRIOR [948]

Answer:

scilian right how ithelps

Step-by-step explanation:

4 0

3 years ago

Identify the slope of the line<br> y=-4- 1/6x

NemiM [27]

Y=mx+b
y=-1/6x-4
slope= -1/6

6 0

2 years ago

1. Express 30 out of 40 and 40 out of 50 as a percentage. Which is<br> the better score?

Ymorist [56]

Answer:

30 out of 40: 75%

40 out of 50: 80%

40 out of 50 is the better score

5 0

3 years ago

For a group of 100 people, compute(a) the expected number of days of the year that are birthdays of exactly 3 people.(b) the exp

Scilla [17]

Answer:

Step-by-step explanation:

Leaving leap years, a year contains 365 days.

For a group of 100 people, each person is independent of the other and probability of any day being his birthday has a chance of

$\frac{1}{365}$

a) Probability that exactly 3 people have same birthday = $\frac{1}{365^3}$

Each day is independent of the other

And hence no of days having exactly 3 persons birthday out of 100 persons is binomial with n = 365 and p = $\frac{1}{365^3}$

Expected value of days = np = $\frac{1}{365^2}$

b) Distinct birthdays is binomail with p =1/365 and n = 365

Hence

expected value = np =1

4 0

3 years ago

Daniel wanted to know his approximate score on the final exam for his mathematics class. His professor hinted that his score was

frozen [14]

Answer: 101.69

Step-by-step explanation:

Formula we use to find the z-score :-

$z=\dfrac{x-\mu}{\sigma}$ (1)

Given : $\mu=90$

$\sigma=7$

Daniel's z score : z= 1.67

Let x be the raw score for Daniel's exam grade, then substitute the values of $\mu,\ \sigma\ and \ x$ in (1), we get

$1.67=\dfrac{x-90}{7}\\\\\Rightarrow\ x-90=7\times1.67\\\\\Rightarrow\ x=11.69+90=101.69$

Hence, the raw score for Daniel's exam grade = 101.69

3 0

3 years ago