Plan B is the answer I’m pretty sure
You need to create common denominators and then add and then subtract to get 22/48
It would be 0.81 because she got 81/100 right. Hope this helpz..
To approximate the P(x<27) we need to find the z-score of the data, this will be given by:
z=(x-μ)/σ
where:
μ-mean
σ-standard deviation
x=27, μ=32, σ=4
z=(27-32)/4
z=-5/4
z=-1.25
thus
P(x<27)=P(z<-1.25)
=0.1056
=10.56%
Answer: 10.56%
