The mean weight of the students in a school is 70 kilograms. A random sample of 25 students was taken and the mean weight was found to be 55 kilograms with a standard deviation of 20 kilograms. What is the test statistics? Express your answer into 2 decimal places (example: 25.00)

-3.75

Step-by-step explanation:

The question refers to the fact that we calculate the value of z in order to know how successful the random sample is in terms of probabilities:

z = (x -m) / (sd / n ^ (1/2))

where x is the value to evaluate, that is to say 55 kg, the standard deviation is sd and would be 20 kg, m is the mean that is 70 and n the size of the random sample that is 25, replacing we are left with:

z = (55 - 70) / (20/25 ^ (1/2))

z = -3.75

this value represents practically 0%, making the sampling that was made very unlikely

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step-by-step explanation:

answer is 12345678900987654321234567890987654321

step-by-step explanation: