What is the approximate area of the shaded region under the standard normal curve below? Use the portion of the standard normal table given to help answer the question. A normal curve with a peak at 0 is shown. The area under the curve shaded is negative 2 to negative 1. z Probability 0.00 0.5000 1.00 0.8413 2.00 0.9772 3.00 0.9987

13.59%

Step-by-step explanation:

The z score is a measure used in statistic to determine by how much standard deviations the raw score is above or below the mean. If the raw score is greater than the mean then the z score is positive but if the raw score is less than the mean then the z score is negative. The z score is calculated using:

From the normal distribution table, Area between z equal -2 and z equal -1  = P(-2 < z < -1) = P(z < -2) - P(z < -1) = 0.1587 - 0.0228 = 0.1359 = 13.59%

answer: b.48 for

step-by-step explanation:

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls