His error is he forgot the 2 in 2 3/4
Solution :
Let x be student will be left handed
P = 0.09
Using the normal approximation to binomial distribution,
a). n = 108,
μ = np = 9.72


= 2.9741
Required probability,
P(x=8) = P(7.5 < x < 8.5)


Using z table,
= P(z<-0.41)-P(z<-0.75)
= 0.3409-0.2266
= 0.1143
b). P(x=12) = P(11.5 < x < 12.5)


Using z table,
= P(z< 0.94)-P(z< 0.60)
= 0.8294 - 0.7257
= 0.1006
She gave away 8 apples because 13 minus 5 is 8
Answer:
247.03125
Step-by-step explanation:
Subtract: 2000 - 23.75 = 1976.25
Divide: 1976.25 / 8 = 247.03125
Hope this helps!