| 9 of 15 (7 complete) This Quiz: 15 pts possidle Question Help * One question f

Question

| 9 of 15 (7 complete) This Quiz: 15 pts possidle Question Help * One question from a survey was "How many credit cards do you currently have? Answer the parts (a) through (d) based on the results of the survey given below P(x) 0.298 | 0.385 | 0101 137 0079 (a) Draw a probability histogram for the random variable X. Choose the correct graph below. O C. 9 04 0.3- 0.2 0.2 0.1 0.2 0 1 0 1234 of credit cards, x 1 234 0 1234 0 1 23 4 eof creda cards, x # of credit cards. x (b) Compute the mean and standard deviation number of credit cards from the probability dis The mean is credit cards Type an integer or a decimal.) Click to select your answer(s). 11:59pm

Explanation / Answer

f=   1  
fx =   1.314  
      
Mean = fx / f =   1.314  
Mean square = f x^2 / f =   3.286  
      
Varriance = (Mean square) - (Mean)^2      
      
Varriance = f x^2 - Mean^2 =   1.559  
Stadard Dev= Var =   1.249  

a.

Option D

b.1.

Mean = 1.314

b.2.

Standard deviation = 1.249

d.

2 childern who issued exactly 2 credits= 0.101 * 0.101 = 0.010201

Values ( X ) Frequency(f) fx ( X^2) f x^2 0 0.298 0 0 0 1 0.385 0.385 1 0.385 2 0.101 0.202 4 0.404 3 0.137 0.411 9 1.233 4 0.079 0.316 16 1.264

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