2. (fpoint) Based on thehist gran inproblem #1,what is th shape fthedistributi n

Question

2. (fpoint) Based on thehist gran inproblem #1,what is th shape fthedistributi notevan blesunbr Days72 The shape of the distvibutton is an equolly drs 3. (I point) In a survey about the number of siblings of college students, the following probability table was be ll sha ped caled unimod al constructed: Number of Siblingsl Probability 4 or more What is the probability that a student hau2,oraiblings?- 4. (I point) Suppose that a family has 5 children and that in general the probability of having a gin s What is the probability of having at least four girls?

Explanation / Answer

3. P [ student has 1,2 or 3 siblings ] = P [ student has 1 sibling ] + P[ student has 2 siblings] + P [ student has 3 siblings] = 0.33+0.17+0.13 = 0.63

4. n=5

p = 0.5 = success probability

X = no of girl child

P[X=x] = nCx px (1-p)n-x

P[ X>=4] = P[X=4]+P[X=5] = 0.1875

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