We are given frequency  distribution in the question 
to find the probability distribution from frequency distribution  we need to divide frequency by total number of observations.
Here, total number of observations are 6+10+7+5=28
so , we will have probability distribution table as 
X	0	1	2	3
P(x)	.21	.35	.25	.17
probability distributiuon describes all possible values that a random variable can take within a given range.
frequency distribution is the presentation that presents  number of observation in given interval.
 
        
             
        
        
        
Answer:
Sample size should be atleast 617
Step-by-step explanation:
given that a 95% confidence interval for the mean of a population is to be constructed and must be accurate to within 0.3 unit.
i.e. margin of error <0.3
Std devition sample = 3.8
For 95% assuming sample size large we can use z critical value
Z critical = 1.96
we have

Sample size should be atleast 617 to get an accurate margin of error 0.3
 
        
             
        
        
        
Answer: 10 
Step-by-step explanation:
Vieta's formulas :
5 - 3i + 5 + 3i = b ⇒ b =10 
Now, we have the equation:
x² -10x + 34 = 0 
Mark me brainliest
 
        
             
        
        
        
Add y to both sides then do the algebra
        
                    
             
        
        
        
Answer:
X^5+3x^4+81x+ 243
Step by step: 
X^4*x=x^5
X^4*3=3x^4
81*x=81x
81*3=243