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zaharov [31]
3 years ago
5

Please help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Mathematics
1 answer:
AVprozaik [17]3 years ago
7 0
Sorry pics aren't good quality...
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The number of text messages sent daily by a student is a poisson random variable with parameter λ=5 .in a class with 20 independ
Rudik [331]
This problem is a combination of the Poisson distribution and binomial distribution.

First, we need to find the probability of a single student sending less than 6 messages in a day, i.e.
P(X<6)=P(X=0)+P(X=1)+P(X=2)+P(X=3)+P(X=4)+P(X=5)
=0.006738+0.033690+0.084224+0.140374+0.175467+0.175467
= 0.615961

For ALL 20 students to send less than 6 messages, the probability is
P=C(20,20)*0.615961^20*(1-0.615961)^0
=6.18101*10^(-5)   or approximately
=0.00006181
7 0
3 years ago
Please help ASAP this is timed
EastWind [94]

Answer:

the answer is 30 with 75 kids voting for drinks in total

8 0
3 years ago
Read 2 more answers
Q is the midpoint of line segment PR. PR=9x-31 and QR=43 ; find x
bulgar [2K]

notice that, if Q is the midpoint of PR, that simply means that PQ = QR = 43.


\bf \boxed{P}\underset{\leftarrow 9x-31 \to }{\stackrel{\stackrel{\downarrow }{43}}{\rule[0.35em]{10em}{0.25pt}}Q\stackrel{43}{\rule[0.35em]{10em}{0.25pt}}}\boxed{R}&#10;\\\\\\&#10;9x-31=43+43\implies 9x-31=86\implies 9x=117&#10;\\\\\\&#10;x=\cfrac{117}{9}\implies x=13

5 0
3 years ago
Find the unknown angle measures.
adell [148]

Answer:

The value of x is 47°

and the value of y is 100°

7 0
3 years ago
HALP PLAEZ IM STRUGGLING<br> brainliest to whoever answers them all!
makvit [3.9K]

Answer:

1. 440:44, songs Per CD: 10

2. 140:5, pieces per bag: 28

3. 30:6, Customers per lane: 5

4. 290:10, students per class: 29

5. 161:7, cans per bag: 28

6. 324:18, tickets per person: 18

7. 90:5, containers per day: 18

8. $80:4, Dollars per ticket: 20

9. 15:3, ice cubes per tray: 5

10. 24:6, buttons per controller: 4

11. 335:67, dollars per shirt: 5

12. 14:2, pies per minute: 7

13. 80:8, dollars per student: 10

Step-by-step explanation:

<em>You put the largest number at the front and divide. For example, 80 ÷ 8 = 10 there you have the rate. Hope this helps! :D</em>

8 0
2 years ago
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