Question: (b) Write an Rcpp function `varC(x)` which computes the sample variance of a numeric vector `x` (assume no missing values). Benchmark your function with a

(b) Write an Rcpp function `varC(x)` which computes the sample variance of a numeric vector `x` (assume no missing values). Benchmark your function with a vector of length 1e5 and compare with `var(x)`.Hint: 1. Use the computational formula of sample variance! 2. Sample variance is not defined if `length(x)` is 1, return `NaN` in this case.

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