Math Answers

find the middle term (2c - 12𝑑)10

The ages of a certain group of students in a junior high school follow a normal

distribution with a mean of 13 and a standard deviation of 1.5. Find the probability

that a randomly selected student is between 10-16 years old.

The ages of a certain group of students in a junior high school follow a normal

distribution with a mean of 13 and a standard deviation of 1.5. Find the probability

that a randomly selected student is between 10-16 years old.

A machine fills coffee powder in pouches, with an average of 200 gm and a standard deviation of 4 gm. Assuming that the coffee weight is normally distributed. Find the probability that a coffee pouch selected at random will contain the following quantity of a coffee: I) At least 200 gm. II) Between 200 to 206 gm

A machine fills coffee powder in pouches, with an average of 200 gm and a standard deviation of 4 gm. Assuming that the coffee weight is normally distributed. Find the probability that a coffee pouch selected at random will contain the following quantity of a coffee: I) At least 200 gm. II) Between 200 to 206 gm

Find the margin of error if the confidence (significant) level is 95%.

1. n = 100, x = 80, s= 2.5

2. n=250, x = 100, s= 3.25

3. n= 300, x = 250, s = 4.15

What is the percentage of common variance between variables if the correlation

coefficient is -0,7?

1. 70%

2. 4,9%

3. -49%

4. 49%

In a Math test, the mean score is 42 and the standard deviation is 3. Assuming normality, what is the probability that the score picked will lie above score 50? *

A pulley with a radius of 14 inches uses bolt to drive a pulley with radius 28 inches. The 14 inches pulleys turned through the angle of 150° .What angle will the 28 inches pulley turns

Find the area under the normal curve for each z-score. Shade accordingly.

1. P( < 2.20)

2. P( -2.5 < z < 2.01)