Is the mean age at which American children first read now equal to four years? If the population of all American children has a mean age of 4 years until they begin to read, which of the following null and alternative hypotheses would be tested to answer this question? O b. Ho: μ = 4 vs. Ha: μ< 4 a. Ho: μ = 4 vs. Ha: μ> 4 d. Ho: μ = 4 vs. Ha: μ = 4 + x, assuming our sample size is n O c. Ho: μ = 4 vs. Ha: µ ‡ 4

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A: 1. 2x + 4y + 3z = 15    4x + 5y + 3z = 24    6x + 5y + 5z = 22    243453655 xyz = 152422Augmented…