Answer:
a. Mean = 20
Sd = 4
b. Probability of X = 20 = 0.1960
Step-by-step explanation:
we have
n = 25
p = 80% = 0.8
mean = np
= 0.8 * 25
= 20
standard deviation = √np(1-p)
= √25*0.8(1-0.8)
=√4
= 2
probability that exactly 20 favours ban
it follows a binomial distribution
= 25C20 × 0.8²⁰ × 0.2⁵
= 53130 × 0.01153 × 0.00032
= 0.1960
Probability of X = 20 = 0.1960
<h2>KL = 27</h2><h2>------------------------------</h2>
<u>Step-by-step explanation:</u>
JM = 27 ---- ( given )
JM = KL
so, KL = 27
<h2>------------------------------</h2><h2>FOLLOW ME</h2>
Answer:
30 envelopes
Step-by-step explanation:
If the Cost of 135 envelopes is Rs 45, then;
135 envelopes = Rs. 45
To get the amount of envelopes Rs. 10 can buy, we can write;
x = Rs. 10
Divide both expressions
135/x = 45/10
45x = 135 * 10
45x = 1350
x = 1350/45
x = 30
Hence Rs. 10 can purchase 30 envelopes
Answer:
3`⁴ = 1/81
Step-by-step explanation:
________________
Answer:
Option- one is correct.
The given system of equations have one solution that is (7,-21)
Step-by-step explanation:
Given system of equations are
Now to the solution:
To solve the given system of equations using substitution method.
That is substitute equation(1) in equation (2) we get
(here y=-3x)
(adding the like terms)
Therefore x=7
Now substitute x=7 in equation (1) we get
Therefore the solution is (7,-21)
Therefore Option- one is correct.
The given system of equations have one solution that is (7,-21)