In a sample of size 40,the sample mean is 15.In this case,the sum of all observations in the sample is 
Xᵢ = 600.
Definitions:
Acquistion Of Culture
The process through which individuals learn the values, norms, customs, knowledge, and skills that guide their behavior in their society.
Fetal Alcohol Spectrum Disorder (FASD)
Range of physical and intellectual impairments observed in some children born to alcoholic parents.
Neurological Diseases
Disorders of the nervous system, including the brain, spinal cord, and nerves, varying in severity from Alzheimer's disease to epilepsy.
Peripheral Nervous System
The Peripheral Nervous System (PNS) consists of the nerves and ganglia outside of the brain and spinal cord, connecting the central nervous system to limbs and organs.
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