ANSWER- 3.45 because if you get 5.30 and subtract 1.85 you’d get 3.45
5-0= 5 would be how you get the 5 at the end of the answer- 3.45
Mean for each hour = 1
Mean for four hours, m = 4
P(x,m)=m^x*e^(-m)/x!
where x is number of defects.
P(X<=3,4)
=P(X=0,4)+P(X=1,4)+P(X=2,4)+P(X=3,4)
=0.01832+0.07326+0.14653+0.19537
=0.43355
Probability of at most 3 defects in four hours is 0.43355
Answer:not this 18x3+19x2-20x+21
Step-by-step explanation:
Answer:
Step-by-step explanation:
cos a cos b+sin a sin b=cos (a-b)
cos 160 cos 10+sin 160 sin 10=cos (160-10)
=cos 150
=cos (180-30)
=-cos 30
=-√3/2