Arandom sample of size 15 taken from a normally distributed population revealed a sample mean of 75 and a sample variance of 25. the upper limit of a 95% confidence interval for the population mean would equal:

77.53

Step-by-step explanation:

Sample size (n) = 15

Sample mean (μ) = 75

Sample variance (V) = 25

Sample standard deviation (σ) = 5

For a 95% confidence interval, z-score = 1.960

The upper limit of the confidence interval is defined as:

Therefore, the upper limit of the 95% confidence interval proposed is 77.53.

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

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