About 33.72% of the consumers spend over $8,000 on a debit card.
The z score is used to determine by how many standard deviations the raw score is above or below the mean. It is given by:
z = (raw score - mean) / standard deviation
Given that:
Mean = $7790, standard deviation = $500, for > $8000:
z = (8000 - 7790)/500 = 0.42
P(z > 0.42) = 1 - P(z < 0.42) = 1 - 0.6628 = 0.3372
About 33.72% of the consumers spend over $8,000 on a debit card.
Find out more on z score at: https://brainly.com/question/25638875
