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Using the paper version of the statistical table, find the value of \( b \). New Statistics Tables,pdf State answers to two decimal places. \[ \begin{aligned} P(z \leq b) & =0.0853 \\ b & =\text { type your answer... } \end{aligned} \] \[ P(zb)=0.8888 \\ b=\text { type your answer... } \end{array} \]

Ask by Hampton Lee. in the United States
Feb 26,2025

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Answer

b = –1.37, 1.33, –0.23, –1.22

Solution

We are given four probability statements involving the standard normal variable z. Using the standard normal (z) table, we find the z‐value corresponding to the given probabilities (to two decimal places): 1. For P(z ≤ b) = 0.0853:   We need b such that the cumulative probability is 0.0853. Looking in the z table, we find that when z = –1.37, P(z ≤ –1.37) ≈ 0.0853.   Answer: b = –1.37 2. For P(z < b) = 0.9082:   Now, we look for the z value giving a cumulative probability of 0.9082. The z table shows that when z = 1.33, P(z < 1.33) ≈ 0.9082.   Answer: b = 1.33 3. For P(z ≥ b) = 0.5910:   Recall that P(z ≥ b) = 1 – P(z ≤ b). Thus,     P(z ≤ b) = 1 – 0.5910 = 0.4090.   Find the z value corresponding to 0.4090. The table indicates that when z = –0.23, P(z ≤ –0.23) ≈ 0.4090.   Answer: b = –0.23 4. For P(z > b) = 0.8888:   Again, notice P(z > b) = 1 – P(z ≤ b), so     P(z ≤ b) = 1 – 0.8888 = 0.1112.   The z table shows that when z = –1.22, P(z ≤ –1.22) ≈ 0.1112.   Answer: b = –1.22 Thus, the answers (rounded to two decimals) are: • P(z ≤ b) = 0.0853 ⟹ b = –1.37 • P(z < b) = 0.9082 ⟹ b = 1.33 • P(z ≥ b) = 0.5910 ⟹ b = –0.23 • P(z > b) = 0.8888 ⟹ b = –1.22

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To find the value of \( b \) in each scenario using the statistical table for the standard normal distribution: For \( P(z \leq b) = 0.0853 \): Looking for the z-score that corresponds to a cumulative probability of 0.0853, we find \( b \approx -1.36 \) when referencing the standard normal table. For \( P(z \geq b) = 0.5910 \): This is equivalent to finding \( P(z < b) = 1 - 0.5910 = 0.4090 \). The z-score corresponding to 0.4090 is approximately \( b \approx -0.23 \). So, for the first equation, \( b \approx -1.36 \), and for the second, \( b \approx -0.23 \). Here's the breakdown: - \( P(z < b) = 0.0853 \) yields \( b = -1.36 \) - \( P(z < b) = 0.4090 \) yields \( b = -0.23 \)

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