0.0420 is wrong

A recent study has shown that 28% of 18-34 year olds check their Facebook/Instagram feeds before getting out of bed in the morning, If we sampled a group of 150 18-34 year olds, what is the probability that the number of them who checked their social media before getting out of bed is: a.) At least 31? 0.9817 b.) No more than 51? 0.0420 X C.) between 38 and 49 (including 38 and 49)? 0.7070v Use the Normal Approximation to the Binomial distribution to answer this question. Question Help: Message instructor Submit