Language Neurological research has shown that in about 80% of people language abilities reside in the brain's left side Another 10% display right-brain language centers, and the remaining 10 have two-sided language control. (The latter two groups are mainly left-handers )

(a) We select 60 people at random is treasonable to use a Normal model to describe the possible distribution of the proportion of the group that has left-brain language control? Explain.

(b) What's the probability that our group has at least 75% left-brainers?

(c) If the group had consisted of 100 people would that probability be higher, lower or about the same? Explain why without actually calculating the probability.

(d) How large a group would almost certainly guarantee at least 75% left-brainers? Explain.

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