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3 years ago

Bev went to lunch with some friends. The bill, including tax, was $20. Bev left a tip of $5.

Mathematics

2 answers:

Gnoma [55]3 years ago

5 0

<span>the percent tip left is 25% of the bill</span>

SSSSS [86.1K]3 years ago

4 0

<span>In order to change this into a percent, you need to multiply this 0.25 by 100, so the percent tip left is 25% of the bill</span>

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Read 2 more answers

A poll reported that 66% of adults were satisfied with the job the major airlines were doing. Suppose 20 adults are selected at

NARA [144]

Answer:

0.5640

Step-by-step explanation:

n = 12 (number of adults)

p = 0.65 (probability that an adult is satisfied with the job the major airlines were doing.

x = number of adults out of 11 who were satisfied.

P( x = 5) = 11C5 (0.65)^5 (0.35)^6 = 0.0986

P( x < 3) = P(x=0)+P(x=1)+P(x=2)

P( x =0) = 11C0 (0.65)^0 (0.35)^11 = 0.0000

P( x =1) = 11C1 (0.65)^1 (0.35)^10 = 0.0002

P( x =2) = 11C2 (0.65)^2 (0.35)^9 = 0.0018

Add: P( x < 3) = 0.0020

P( x ≥ 8) = P(x=8)+P(x=9)+P(x=10)+P(x=11)

P( x =8) = 11C8 (0.65)^8 (0.35)^3 = 0.2254

P( x =9) = 11C9 (0.65)^9 (0.35)^2 = 0.1395

P( x =10) = 11C10 (0.65)^10 (0.35)^1 = 0.0518

P( x =11) = 11C11 (0.65)^11 (0.35)^0 = 0.0087

add:

P( x ≥ 8) = 0.4254

P(x=4)+P(x=5)+P(x=6)+P(x=7)

P( x =4) = 11C4 (0.65)^4 (0.35)^7 = 0.0379

P( x =5) = 11C5 (0.65)^5 (0.35)^6 = 0.0985

P( x =6) = 11C6 (0.65)^6 (0.35)^5 = 0.1830

P( x =7) = 11C7 (0.65)^7 (0.35)^4 = 0.2428

Add: 0.5640

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