Answer:maybe search up the meaanings
Step-by-step explanation:
Answer:
Step-by-step explanation:
Let r = .25 probability of getting question right. and w = .75 prob getting it wrong.
since there are 10 questions, this will tell us what we want to know.
a) 1- doesn't get them all wrong.
1-
=1-.0563
=.9437
b) Probability of getting 6-10 answers right
=.0197
c)
This means 9 or 10 answer should be right
=.00003
d)
= 2.5 expected correct answers.
e)
Standard deviation for a binomial distribution is
=
=
=1.369
Answer:
9.9 years
Step-by-step explanation:
A = P e ^(rt)
Where A is the amount in the account
P is the amount invested
R is the interest rate
t is the time
P = 8500
r =7% = .07
A = 17000
Substituting into the equation
17000=8500 e^(.07t)
Divide each side by 8500
17000/8500=8500/8500 e^(.07t)
2 = e^(.07t)
Take the natural log of each side
ln (2) = ln e^(.07t)
ln(2) = .07t
Divide each side by .07
ln(2)/.07 = .07t/.07
ln(2)/.07 = t
9.902102579=t
Rounding to one decimal place
9.9 years
Answer: A
Step-by-step explanation: