7.81 The following data represent the exchange rate of Malaysian ringgit (RMY) to Hong Kong dollar (HKD), retrieved from the Interbank Foreign Exchange Market in Kuala Lumpur, Malaysia, from September 10, 2021 to October 8, 2021.

54.3511 54.3409 54.3687 54.2803 54.2483 54.2774 54.4619 54.4398 54.4269 54.4987 54.4437 54.3397 54.4186 54.4087 54.2978 54.1516 54.1492 53.8431 53.8545 53.5300 53.2934 53.4620 53.4347 53.3160 53.3453 53.4665 53.3350 53.2635 53.2660 53.3376 Estimate the average exchange rate of RMY to HKD with a 95% interval estimate.