(Answered) 1 suppose the first two bins of a group data distribution

Statistics

1. Suppose the first two bins of a group data distribution are 12.0 to 14.9, and 15.0 to 16.9.

(a) What is the MIDPOINT of the 3^rd bin?

(b) What is the lower BOUNDARY of the 3^rd bin?

2. The distribution of X is normally distributed with mean µ=78.6 and standard deviation σ= 8.56.

(a) What proportion of X is larger than 82.2?

(b) Find x₀, to one decimal place, such that P(X>x₀) = 0.63

(d) If four data values are selected at random from X, what is the probability at least one of the data values selected is larger than 78.6?

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