Let z ∼ n (0, 1). for a random vector (x1, . . , xn) where n is a positive integer and x1, . . , xn are real-valued random variables, the expectation of (x1, . . , xn) is the vector of elementwise expectations of each random variable and the covariance matrix of (x1, . . , xn) is the n × n matrix whose (i, j) entry is cov(xi , xj ) for all i, j ∈ {1, . . , n}. find the mean and covariance matrix of (z, 1{z > c}) in terms of φ and φ, the standard gaussian pdf and cdf respectively

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.

i need more details sorry

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