Word Count : 390

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To solve this problem, we first need to convert the given account balances into standard scores (Z-scores) using the formula:

Z=X−μσZ = \frac{X - \mu}{\sigma}

Where:

• ZZ is the Z-score,

• XX is the raw score (account balance),

• μ\mu is the mean, and

• σ\sigma is the standard deviation.

Part (a): Proportion of accounts over Rs 150

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